All visitors ___ register at the front desk before entering the building.
Choose the modal that expresses a formal requirement in official rules.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: A)All visitors must register at the front desk.
💡 Explicación
Written rules and regulations are expressed with 'must', 'have to' or 'should'. The modal carries the obligation and the verb that follows is always the base form, with no ending and no infinitive marker.
Ver respuesta
Respuesta correcta: A)All visitors must register at the front desk.
A)All visitors must register at the front desk.Correct! 'Must' expresses a requirement that comes from outside the speaker, and it is followed by the base form.
B)All visitors must to register at the front desk.'Must to' adds an infinitive marker that never follows a modal verb in English.
C)All visitors must registering at the front desk.'Must registering' needs the base form after the modal, so the correct form is 'must register'.
D)All visitors not must register at the front desk.'Not must' places 'not' in front of the modal, but the negative of 'must' is 'must not'.
💡 Explicación
Written rules and regulations are expressed with 'must', 'have to' or 'should'. The modal carries the obligation and the verb that follows is always the base form, with no ending and no infinitive marker.
Pregunta 2
Pregunta 2 · D3Bloom: Understand
You ___ wear a helmet when you ride a motorcycle. It is the law.
Complete the sentence with the modal that expresses a legal obligation.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: D)You must wear a helmet when you ride a motorcycle.
💡 Explicación
Legal obligations are almost always reported with 'must'. Unlike ordinary verbs, modals do not change with the subject, so 'you must', 'she must' and 'they must' are all identical in form.
Ver respuesta
Respuesta correcta: D)You must wear a helmet when you ride a motorcycle.
A)You must to wear a helmet when you ride a motorcycle.'Must to wear' adds an infinitive marker that never follows a modal verb.
B)You must wearing a helmet when you ride a motorcycle.'Must wearing' needs the base form after the modal, so the correct form is 'must wear'.
C)You must wears a helmet when you ride a motorcycle.'Must wears' adds the third person ending after a modal, which never happens in English.
D)You must wear a helmet when you ride a motorcycle.Correct! 'Must' states the legal requirement and is followed by the base form 'wear' with no ending.
💡 Explicación
Legal obligations are almost always reported with 'must'. Unlike ordinary verbs, modals do not change with the subject, so 'you must', 'she must' and 'they must' are all identical in form.
Pregunta 3
Pregunta 3 · D4Bloom: Apply
You ___ come to the meeting; it's optional, not compulsory.
Choose the modal that expresses the absence of an obligation.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: B)You don't have to come to the meeting; attendance is optional.
💡 Explicación
The absence of an obligation is 'don't have to' or 'needn't'. It must not be confused with 'must not', which forbids the action entirely: you don't have to come, but you must not smoke here.
Ver respuesta
Respuesta correcta: B)You don't have to come to the meeting; attendance is optional.
A)You must not come to the meeting; attendance is optional.'Must not' expresses a total prohibition, which is the opposite of saying that attendance is optional.
B)You don't have to come to the meeting; attendance is optional.Correct! 'Don't have to' expresses that there is no obligation, which is exactly what optional means.
C)You don't have to coming to the meeting; attendance is optional.'Don't have to coming' needs the base form after 'have to', so the correct form is 'don't have to come'.
D)You mustn't to come to the meeting; attendance is optional.'Mustn't to' adds an infinitive marker that never follows a modal verb.
💡 Explicación
The absence of an obligation is 'don't have to' or 'needn't'. It must not be confused with 'must not', which forbids the action entirely: you don't have to come, but you must not smoke here.
Pregunta 4
Pregunta 4 · D4Bloom: Analyze
Students ___ use their phones in the examination room.
Complete the sentence with the modal that expresses a prohibition in the exam rules.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: C)Students must not use their phones in the examination room.
💡 Explicación
'Must not' forbids an action completely. The softer prohibition 'shouldn't' gives advice against it, and 'don't have to' removes the obligation without forbidding anything.
Ver respuesta
Respuesta correcta: C)Students must not use their phones in the examination room.
A)Students not must use their phones in the examination room.'Not must' places 'not' before the modal, but English forms the negative as 'must not'.
B)Students must not using their phones in the examination room.'Must not using' needs the base form after the modal, so the correct form is 'must not use'.
C)Students must not use their phones in the examination room.Correct! 'Must not' states a total prohibition, which is what the exam rules require.
D)Students must to not use their phones in the examination room.'Must to not' adds a second infinitive marker after the modal and is not grammatical.
💡 Explicación
'Must not' forbids an action completely. The softer prohibition 'shouldn't' gives advice against it, and 'don't have to' removes the obligation without forbidding anything.
Pregunta 5
Pregunta 5 · D5Bloom: Evaluate
Everyone should ___ a first aid course before starting this job.
Complete the sentence with the correct modal perfect form.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: A)Everyone should take a first aid course before starting this job.
💡 Explicación
'Should' expresses advice about what somebody ought to do, and it is used with 'everybody', 'nobody' and 'somebody' in formal statements of recommendation: everybody should bring identification.
Ver respuesta
Respuesta correcta: A)Everyone should take a first aid course before starting this job.
A)Everyone should take a first aid course before starting this job.Correct! 'Should' is used to advise, and the modal is followed by the base form 'take'.
B)Everyone should takes a first aid course before starting this job.'Should takes' adds the third person ending after a modal, which is not a form in English.
C)Everyone should to take a first aid course before starting this job.'Should to take' adds an infinitive marker that never follows a modal verb.
D)Everyone should taking a first aid course before starting this job.'Should taking' needs the base form after the modal, so the correct form is 'should take'.
💡 Explicación
'Should' expresses advice about what somebody ought to do, and it is used with 'everybody', 'nobody' and 'somebody' in formal statements of recommendation: everybody should bring identification.
Pregunta 6
Pregunta 6 · D4Bloom: Remember
You look exhausted. You ___ go home and rest instead of working tonight.
Choose the modal that gives advice about what would be wiser to do.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: C)You had better go home and rest instead of working tonight.
💡 Explicación
'Had better' gives advice that carries a warning: you had better leave now or you will miss the last bus. It is slightly stronger than 'should' and always takes the base form.
Ver respuesta
Respuesta correcta: C)You had better go home and rest instead of working tonight.
A)You had better going home and rest instead of working tonight.'Had better going' needs the base form after the modal, so the correct form is 'had better go'.
B)You ought to go home and rest instead of working tonight.'Ought to' is the formal equivalent of 'should' and gives the same advice, but it takes the infinitive marker 'to'.
C)You had better go home and rest instead of working tonight.Correct! 'Had better' is the standard expression for advice of this kind and is followed by the base form.
D)You had better to going home and rest instead of working tonight.'Better to going' mixes an infinitive marker with an -ing form, which is not an English construction.
💡 Explicación
'Had better' gives advice that carries a warning: you had better leave now or you will miss the last bus. It is slightly stronger than 'should' and always takes the base form.
Pregunta 7
Pregunta 7 · D5Bloom: Understand
The sign at the entrance says: 'All employees ___ wear an identification badge while on duty.'
Choose the option that best completes the sign.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: D)All employees must wear an identification badge while on duty.
💡 Explicación
Signs and notices avoid the ambiguity of the present simple or the future, and use 'must' with the infinitive. The sentence therefore stays short, formal and unambiguous for every reader who sees it.
Ver respuesta
Respuesta correcta: D)All employees must wear an identification badge while on duty.
A)All employees must to wear an identification badge while on duty.'Must to wear' adds an infinitive marker that never follows a modal verb.
B)All employees must wears an identification badge while on duty.'Must wears' adds the third person ending after a modal, which never happens in English.
C)All employees must wearing an identification badge while on duty.'Must wearing' needs the base form after the modal, so the correct form is 'must wear'.
D)All employees must wear an identification badge while on duty.Correct! Written signs use 'must' with the base form to state a requirement with no ambiguity.
💡 Explicación
Signs and notices avoid the ambiguity of the present simple or the future, and use 'must' with the infinitive. The sentence therefore stays short, formal and unambiguous for every reader who sees it.
Pregunta 8
Pregunta 8 · D3Bloom: Apply
You don't have to come to the ceremony, but you really ___ apologize for not coming.
Complete the sentence with the modal that expresses a moral obligation.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: B)You don't have to come, but you really should apologize for not coming.
💡 Explicación
English distinguishes an external rule, expressed by 'must' or 'have to', from a personal or moral recommendation, expressed by 'should'. The difference is the source of the obligation, not its strength alone.
Ver respuesta
Respuesta correcta: B)You don't have to come, but you really should apologize for not coming.
A)You don't have to come, but you really should to apologize for not coming.'Should to' adds an infinitive marker that never follows a modal verb.
B)You don't have to come, but you really should apologize for not coming.Correct! 'Should' expresses what is morally expected, and 'don't have to' expresses what is merely optional.
C)You don't have to come, but you really should apologizing for not coming.'Should apologizing' needs the base form after the modal, so the correct form is 'should apologize'.
D)You don't have to come, but you really are should apologize for not coming.'Are should' combines the auxiliary 'are' with the modal 'should', which is not grammatical in English.
💡 Explicación
English distinguishes an external rule, expressed by 'must' or 'have to', from a personal or moral recommendation, expressed by 'should'. The difference is the source of the obligation, not its strength alone.
Pregunta 9
Pregunta 9 · D4Bloom: Analyze
The company requires all staff ___ arrive before eight o'clock, every single day.
Choose the modal that expresses a repeated company requirement.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: A)The company requires all staff to arrive before eight every day.
💡 Explicación
Reporting verbs that impose an obligation take the pattern 'require somebody to do something'. When the obligation comes from outside, the infinitive replaces the modal: the school requires students to wear a uniform instead of saying they must wear one.
Ver respuesta
Respuesta correcta: A)The company requires all staff to arrive before eight every day.
A)The company requires all staff to arrive before eight every day.Correct! 'Requires somebody to do' is the structure for an obligation imposed on a person, and 'to arrive' is the correct infinitive.
B)The company requires all staff arrive before eight every day.'Requires all staff arrive' lacks the 'to' of the infinitive after the reporting verb 'require'.
C)The company requires all staff arriving before eight every day.'Requires all staff arriving' mixes the bare infinitive structure with a gerund, which is not a valid pattern here.
D)The company requires all staff arrived before eight every day.'Requires all staff arrived' uses the past participle where the infinitive is needed to state the requirement.
💡 Explicación
Reporting verbs that impose an obligation take the pattern 'require somebody to do something'. When the obligation comes from outside, the infinitive replaces the modal: the school requires students to wear a uniform instead of saying they must wear one.
Pregunta 10
Pregunta 10 · D5Bloom: Evaluate
It's not necessary for you to bring anything, but you ___ bring a copy of your passport.
Choose the modal that expresses what is formally necessary in this case.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: B)You must bring a copy of your passport to the appointment.
💡 Explicación
Formal necessities at an appointment, an examination or a border are stated with 'must' or 'have to'. The choice between them is a matter of register rather than of meaning, since both report an external requirement.
Ver respuesta
Respuesta correcta: B)You must bring a copy of your passport to the appointment.
A)You must brings a copy of your passport to the appointment.'Must brings' adds the third person ending after a modal, which never happens in English.
B)You must bring a copy of your passport to the appointment.Correct! 'Must' states that the copy is formally necessary, and the modal is followed by the base form.
C)You must to bring a copy of your passport to the appointment.'Must to bring' adds an infinitive marker that never follows a modal verb.
D)You must bringing a copy of your passport to the appointment.'Must bringing' needs the base form after the modal, so the correct form is 'must bring'.
💡 Explicación
Formal necessities at an appointment, an examination or a border are stated with 'must' or 'have to'. The choice between them is a matter of register rather than of meaning, since both report an external requirement.
Pregunta 11
Pregunta 11 · D3Bloom: Remember
You ___ park outside the gate; the residents have parking of their own.
Choose the sentence that expresses a polite request rather than a rule.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: D)Could you park outside the gate instead of in front of the house?
💡 Explicación
'Could', 'would' and 'might' make a request polite because they sound less direct than 'can'. The structure is always the same: modal plus subject plus base form of the verb.
Ver respuesta
Respuesta correcta: D)Could you park outside the gate instead of in front of the house?
A)Could you parking outside the gate instead of in front of the house?'Could you parking' needs the base form after the modal, so the correct form is 'could you park'.
B)Could you parked outside the gate instead of in front of the house?'Could you parked' places a past participle after the modal, which is not the form a modal takes.
C)Could you to park outside the gate instead of in front of the house?'Could you to park' adds an infinitive marker that never follows a modal verb.
D)Could you park outside the gate instead of in front of the house?Correct! 'Could you park' is the polite form of a request, with the modal followed by the base form.
💡 Explicación
'Could', 'would' and 'might' make a request polite because they sound less direct than 'can'. The structure is always the same: modal plus subject plus base form of the verb.
Pregunta 12
Pregunta 12 · D3Bloom: Understand
Students are not allowed to bring pets into the laboratory.
Choose the sentence that expresses the same prohibition with a modal.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: C)Students must not bring pets into the laboratory.
💡 Explicación
'Are not allowed to' and 'must not' express the same prohibition. The modal version is shorter and works better in short notices, while the passive form reads better in formal documents.
Ver respuesta
Respuesta correcta: C)Students must not bring pets into the laboratory.
A)Students not must bring pets into the laboratory.'Not must' places 'not' in front of the modal, but English forms the negative as 'must not'.
B)Students must not bringing pets into the laboratory.'Must not bringing' needs the base form after the modal, so the correct form is 'must not bring'.
C)Students must not bring pets into the laboratory.Correct! 'Must not' is the modal way to state a total prohibition of the same rule.
D)Students must brings pets into the laboratory.'Must brings' adds the third person ending after a modal, which never happens in English.
💡 Explicación
'Are not allowed to' and 'must not' express the same prohibition. The modal version is shorter and works better in short notices, while the passive form reads better in formal documents.
Pregunta 13
Pregunta 13 · D4Bloom: Apply
Every member of the club ___ pay the annual fee before the first meeting.
Choose the modal that expresses an obligation with an indefinite subject.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: A)Every member of the club must pay the annual fee before the first meeting.
💡 Explicación
Because a modal carries no person or number, the verb after it is always the base form. This makes modals especially useful in rules with indefinite subjects such as 'every student', 'any visitor' or 'nobody'.
Ver respuesta
Respuesta correcta: A)Every member of the club must pay the annual fee before the first meeting.
A)Every member of the club must pay the annual fee before the first meeting.Correct! 'Must' does not change with the subject, so it is the same whatever follows 'every member of the club'.
B)Every member of the club must pays the annual fee before the first meeting.'Must pays' adds the third person ending, but modals never take that ending in English.
C)Every member of the club must to pay the annual fee before the first meeting.'Must to pay' adds an infinitive marker that never follows a modal verb.
D)Every member of the club must paying the annual fee before the first meeting.'Must paying' needs the base form after the modal, so the correct form is 'must pay'.
💡 Explicación
Because a modal carries no person or number, the verb after it is always the base form. This makes modals especially useful in rules with indefinite subjects such as 'every student', 'any visitor' or 'nobody'.
Pregunta 14
Pregunta 14 · D4Bloom: Analyze
They warned us that we ___ leave the gate open, because thieves had been seen in the area.
Choose the reported modal that expresses a strong requirement in the past.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: C)They warned us that we must not leave the gate open.
💡 Explicación
Unlike ordinary verbs, modals keep their form in indirect speech. 'He said we must not leave' reports 'We must not leave' without any change, because 'must' expresses requirement rather than time.
Ver respuesta
Respuesta correcta: C)They warned us that we must not leave the gate open.
A)They warned us that we not must leave the gate open.'Not must' places 'not' before the modal, but English forms the negative as 'must not'.
B)They warned us that we must not leaving the gate open.'Must not leaving' needs the base form after the modal, so the correct form is 'must not leave'.
C)They warned us that we must not leave the gate open.Correct! A modal does not change when a statement is reported, so 'must not' keeps the same form and meaning.
D)They warned us that we must not to leave the gate open.'Must not to' adds a second infinitive marker after the modal and is not grammatical.
💡 Explicación
Unlike ordinary verbs, modals keep their form in indirect speech. 'He said we must not leave' reports 'We must not leave' without any change, because 'must' expresses requirement rather than time.
Pregunta 15
Pregunta 15 · D5Bloom: Evaluate
You have been offered the position, so you ___ ask for more time before accepting it.
Choose the modal that gives advice about the next sensible step.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: B)You should ask for more time before accepting the position.
💡 Explicación
'Should' is the neutral advisory modal in English. It is used both for general recommendations and for specific advice about a decision the listener still has to make.
Ver respuesta
Respuesta correcta: B)You should ask for more time before accepting the position.
A)You should to ask for more time before accepting the position.'Should to' adds an infinitive marker that never follows a modal verb.
B)You should ask for more time before accepting the position.Correct! 'Should' advises the person on what would be sensible to do, and it takes the base form.
C)You should asking for more time before accepting the position.'Should asking' needs the base form after the modal, so the correct form is 'should ask'.
D)You are should ask for more time before accepting the position.'Are should' combines the auxiliary 'are' with the modal 'should', which is not grammatical in English.
💡 Explicación
'Should' is the neutral advisory modal in English. It is used both for general recommendations and for specific advice about a decision the listener still has to make.
Pregunta 16
Pregunta 16 · D4Bloom: Remember
Everyone must ___ the deadline, and the extension has to be approved today.
Complete the sentence with the correct modal and verb form.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: D)Everyone must respect the deadline.
💡 Explicación
When two obligations appear in one sentence, both are expressed with the same modal or with a modal and 'have to'. Each verb that follows keeps its base form, so the parallel structure stays visible.
Ver respuesta
Respuesta correcta: D)Everyone must respect the deadline.
A)Everyone must respecting the deadline.'Must respecting' needs the base form after the modal, so the correct form is 'must respect'.
B)Everyone must respects the deadline.'Must respects' adds the third person ending after a modal, which never happens in English.
C)Everyone must to respect the deadline.'Must to respect' adds an infinitive marker that never follows a modal verb.
D)Everyone must respect the deadline.Correct! 'Must respect' states the obligation and the modal is followed by the base form with no ending.
💡 Explicación
When two obligations appear in one sentence, both are expressed with the same modal or with a modal and 'have to'. Each verb that follows keeps its base form, so the parallel structure stays visible.
Pregunta 17
Pregunta 17 · D5Bloom: Understand
Students aren't allowed to use calculators in this exam, and the invigilators will collect them.
Choose the sentence that states the same rule with a modal in the negative.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: A)Students must not use calculators in this exam.
💡 Explicación
Examination instructions are among the clearest uses of 'must not' in English, since the prohibition is absolute and the consequences are stated. The modal cannot be replaced by any other auxiliary in that context.
Ver respuesta
Respuesta correcta: A)Students must not use calculators in this exam.
A)Students must not use calculators in this exam.Correct! 'Must not' expresses the total prohibition described by the first sentence.
B)Students must not using calculators in this exam.'Must not using' needs the base form after the modal, so the correct form is 'must not use'.
C)Students not must use calculators in this exam.'Not must' places 'not' before the modal, but English forms the negative as 'must not'.
D)Students must not to use calculators in this exam.'Must not to' adds a second infinitive marker after the modal and is not grammatical.
💡 Explicación
Examination instructions are among the clearest uses of 'must not' in English, since the prohibition is absolute and the consequences are stated. The modal cannot be replaced by any other auxiliary in that context.
Pregunta 18
Pregunta 18 · D3Bloom: Apply
Ought I to tell the teacher about the mistake, or is it unnecessary?
Choose the sentence that correctly forms the question with 'ought'.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: B)Ought I to tell the teacher, or is it unnecessary?
💡 Explicación
'Ought to' is the formal equivalent of 'should' and it does take the infinitive marker 'to'. In questions the subject follows the modal: ought I to tell her, ought we to leave early.
Ver respuesta
Respuesta correcta: B)Ought I to tell the teacher, or is it unnecessary?
A)Ought I telling the teacher, or is it unnecessary?'Ought I telling' needs the infinitive marker 'to' rather than the -ing form after the modal.
B)Ought I to tell the teacher, or is it unnecessary?Correct! 'Ought' behaves like 'should', with the infinitive 'to tell' and the subject placed after it in a question.
C)Ought to I telling the teacher, or is it unnecessary?'Ought to I' places the infinitive marker in front of the subject, which does not happen in a question.
D)Ought I tell to the teacher, or is it unnecessary?'Ought I tell to' inserts an infinitive marker that already appears after 'ought', so it appears twice.
💡 Explicación
'Ought to' is the formal equivalent of 'should' and it does take the infinitive marker 'to'. In questions the subject follows the modal: ought I to tell her, ought we to leave early.
Pregunta 19
Pregunta 19 · D4Bloom: Analyze
Applicants have to submit the form online, and the office ___ receive applications by post.
Complete the sentence with the correct modal for the second obligation.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: D)The office will not receive applications by post.
💡 Explicación
Formal refusals are often expressed with 'will not' or, more emphatically, 'shall not'. Both modals are followed by the base form and neither changes for the third person singular.
Ver respuesta
Respuesta correcta: D)The office will not receive applications by post.
A)The office will receives not applications by post.'Will receives not' places both a third person ending and 'not' in an impossible combination.
B)The office not receive applications by post.'Not receive' places 'not' before the main verb, but a modal carries its own negation.
C)The office will not receiving applications by post.'Will not receiving' needs the base form after the modal, so the correct form is 'will not receive'.
D)The office will not receive applications by post.Correct! 'Will not' states the refusal of the office in a formal way, and the modal is followed by the base form.
💡 Explicación
Formal refusals are often expressed with 'will not' or, more emphatically, 'shall not'. Both modals are followed by the base form and neither changes for the third person singular.
Pregunta 20
Pregunta 20 · D5Bloom: Evaluate
You don't have to worry about the deposit; the hotel will waive it for groups.
Choose the sentence that correctly distinguishes absence of obligation from a future action.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: C)You don't have to worry; the hotel will waive the deposit for groups.
💡 Explicación
'Don't have to' describes the absence of a requirement, while 'will' plus the base form states a future action. Using both in one sentence contrasts what the listener does not need to do with what the hotel will do.
Ver respuesta
Respuesta correcta: C)You don't have to worry; the hotel will waive the deposit for groups.
A)You don't have to worry; the hotel will to waive the deposit for groups.'Will to waive' adds an infinitive marker that never follows a modal verb.
B)You don't have to worry; the hotel will waived the deposit for groups.'Will waived' places a past participle after the modal, which is not the form a modal takes.
C)You don't have to worry; the hotel will waive the deposit for groups.Correct! 'Don't have to' removes the obligation and 'will waive' states what the hotel is going to do.
D)You don't have to to worry; the hotel will waive the deposit for groups.'Don't have to to' adds a second infinitive marker after 'have to' and is not grammatical.
💡 Explicación
'Don't have to' describes the absence of a requirement, while 'will' plus the base form states a future action. Using both in one sentence contrasts what the listener does not need to do with what the hotel will do.
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