A student describes her own linguistic skills during a class interview.
She ____ speak three languages, but she only speaks two.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: A)can
💡 Explicación
'Can' is the modal of ability in the present. Its negative and interrogative forms are built the same way, without an auxiliary 'to'.
Ver respuesta
Respuesta correcta: A)can
A)canCorrect! 'Can' expresses ability in the present, and the second clause limits how much of that ability is real.
B)may'May' expresses permission or possibility, not skill.
C)must'Must' expresses obligation, which says nothing about capacity.
D)should'Should' expresses advice or expectation, not what a person is able to do.
💡 Explicación
'Can' is the modal of ability in the present. Its negative and interrogative forms are built the same way, without an auxiliary 'to'.
Pregunta 2
Pregunta 2 · D3Bloom: Apply
A group of friends discusses a weekend trip to the Caribbean coast.
You ____ drive if you want to go to the coast this weekend.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: B)can
💡 Explicación
Ability in the present is 'can'. The past ability is 'could' and a remote possibility is 'might', so the time reference decides the modal.
Ver respuesta
Respuesta correcta: B)can
A)could'Could' would suggest the ability existed in the past.
B)canCorrect! 'Can' offers the possibility of driving here and now, since the plan is for the coming weekend.
C)may'May' is used formally to give or ask for permission.
D)might'Might' expresses a small possibility, which is weaker than a clear ability.
💡 Explicación
Ability in the present is 'can'. The past ability is 'could' and a remote possibility is 'might', so the time reference decides the modal.
Pregunta 3
Pregunta 3 · D3Bloom: Apply
A man remembers an ability he had as a child and no longer has.
As a child he ____ swim across the river, but he cannot do it now.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: C)could
💡 Explicación
'Could' is the past simple of the modal 'can'. Because the second clause is a present impossibility, the first must be past.
Ver respuesta
Respuesta correcta: C)could
A)can'Can' would place the ability in the present, which the second clause denies.
B)may'May' expresses permission, and no permission is discussed.
C)couldCorrect! 'Could' describes an ability that existed in the past and no longer holds.
D)must'Must' expresses obligation, which does not describe capacity at all.
💡 Explicación
'Could' is the past simple of the modal 'can'. Because the second clause is a present impossibility, the first must be past.
Pregunta 4
Pregunta 4 · D3Bloom: Apply
A teacher gives a rule before an examination session.
The teacher says we ____ use our phones during the written test.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: D)cannot
💡 Explicación
Modal verbs never change form. 'Cannot' stays the same in every person, which is one of their defining features.
Ver respuesta
Respuesta correcta: D)cannot
A)might'Might' would leave the possibility open, and a prohibition closes it.
B)could'Could' would describe a past ability.
C)should'Should' expresses a recommendation, and teachers prohibit rather than recommend.
D)cannotCorrect! 'Cannot' states that the action is outside what the rules allow.
💡 Explicación
Modal verbs never change form. 'Cannot' stays the same in every person, which is one of their defining features.
Pregunta 5
Pregunta 5 · D4Bloom: Apply
A classmate apologises for turning down a request on a busy day.
I am sorry, I ____ help you with the project today.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: A)cannot
💡 Explicación
An apology followed by a reason about availability calls for 'cannot'. 'Must not' would place the limit outside the speaker.
Ver respuesta
Respuesta correcta: A)cannot
A)cannotCorrect! 'Cannot' explains a lack of capacity or availability.
B)must not'Must not' expresses a prohibition that somebody imposes.
C)need not'Need not' removes an obligation and does not explain an apology.
D)should not'Should not' gives advice against an action, but the speaker lacks the time, not the permission.
💡 Explicación
An apology followed by a reason about availability calls for 'cannot'. 'Must not' would place the limit outside the speaker.
Pregunta 6
Pregunta 6 · D3Bloom: Understand
A friend asks about a swimming skill before an outing in a rural area.
____ you swim in the river, or are you afraid of the water?
Elige una opción para comprobar tu respuesta.
Respuesta correcta: B)Can
💡 Explicación
The interrogative of the modal 'can' inverts the subject and the modal, with no auxiliary 'do' and no change of form.
Ver respuesta
Respuesta correcta: B)Can
A)Must'Must' asks about an obligation, which is not the contrast being drawn.
B)CanCorrect! 'Can' is the modal used to ask about ability in the present.
C)Should'Should' asks whether something is advisable.
D)Would'Would' asks about a past habit or a hypothetical, not about a real skill.
💡 Explicación
The interrogative of the modal 'can' inverts the subject and the modal, with no auxiliary 'do' and no change of form.
Pregunta 7
Pregunta 7 · D3Bloom: Apply
A student explains a habit that supports exam preparation.
Reading in English ____ me a lot of useful vocabulary for the exam.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: C)can
💡 Explicación
The subject of a modal can be any noun phrase, not only a person. The modal stays in the infinitive form after it.
Ver respuesta
Respuesta correcta: C)can
A)may'May' expresses permission, which is not the point of the sentence.
B)must'Must' would state an obligation.
C)canCorrect! 'Can' is used in the present simple with 'me' as its subject to state a benefit.
D)may not'May not' would state that no benefit exists, which the sentence denies.
💡 Explicación
The subject of a modal can be any noun phrase, not only a person. The modal stays in the infinitive form after it.
Pregunta 8
Pregunta 8 · D3Bloom: Apply
A man narrates the reason why he signed up for a swimming course last year.
He ____ not swim when he was ten, so he took a course last year.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: D)could
💡 Explicación
Past ability is expressed with 'could' plus the bare infinitive. The course follows the inability, which confirms the past time frame.
Ver respuesta
Respuesta correcta: D)could
A)can'Can' would refer to the present, which the second clause contradicts.
B)will'Will' describes a future action.
C)would'Would' describes a past habit or a polite offer, not a past ability.
D)couldCorrect! 'Could' is the past form of the ability modal and matches the past time reference.
💡 Explicación
Past ability is expressed with 'could' plus the bare infinitive. The course follows the inability, which confirms the past time frame.
Pregunta 9
Pregunta 9 · D3Bloom: Apply
An injured student is advised to see the school doctor.
She is a doctor, so she ____ help you with that injury.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: A)can
💡 Explicación
A modal expresses what is possible, permitted or necessary. The first two are excluded by the time frame and the third by the certainty of the statement.
Ver respuesta
Respuesta correcta: A)can
A)canCorrect! 'Can' states a real and present professional ability.
B)could'Could' would point to a capacity in the past.
C)might'Might' would only suggest a possibility, weaker than what a doctor can do.
D)would'Would' would be used for a conditional or a past habit.
💡 Explicación
A modal expresses what is possible, permitted or necessary. The first two are excluded by the time frame and the third by the certainty of the statement.
Pregunta 10
Pregunta 10 · D4Bloom: Analyze
A parent describes the motor development of a baby at home.
The baby ____ not walk yet, but he ____ crawl very well.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: B)cannot ... can
💡 Explicación
Two coordinated clauses keep the same modal form in both. Here the first is negative and the second positive, which the pair of modals must reflect.
Ver respuesta
Respuesta correcta: B)cannot ... can
A)can ... can'Can ... cannot' reverses the two facts.
B)cannot ... canCorrect! 'Cannot' states a missing capacity and 'can' a present one, which is the contrast described.
C)can ... cannot'Cannot ... cannot' denies both abilities.
D)must ... can'Must' would express obligation, which does not describe motor development.
💡 Explicación
Two coordinated clauses keep the same modal form in both. Here the first is negative and the second positive, which the pair of modals must reflect.
Pregunta 11
Pregunta 11 · D3Bloom: Apply
A student makes a polite request in the language laboratory.
____ you help me carry these boxes, please?
Elige una opción para comprobar tu respuesta.
Respuesta correcta: C)Could
💡 Explicación
The past form of the modal is used for politeness in requests. The tense of the form does not refer to time; it softens the tone.
Ver respuesta
Respuesta correcta: C)Could
A)Must'Must' is never used to ask for a favour; it states an obligation.
B)Should'Should' asks about advice.
C)CouldCorrect! 'Could' is the polite form of 'can' used to make a request.
D)Need'Need' is a main verb here, and the negative form would be a different construction.
💡 Explicación
The past form of the modal is used for politeness in requests. The tense of the form does not refer to time; it softens the tone.
Pregunta 12
Pregunta 12 · D3Bloom: Apply
A notice lists the rules of a school evacuation procedure.
Students ____ not stay in the classroom during the fire drill.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: D)must
💡 Explicación
'Must not' and 'need not' are different: 'must not' forbids, while 'need not' merely says an obligation does not exist.
Ver respuesta
Respuesta correcta: D)must
A)could'Could' is a past ability modal, which does not express a rule.
B)can'Can' would state a possibility or an ability.
C)may'May' expresses permission, and the sign forbids rather than allows.
D)mustCorrect! 'Must not' states a strict prohibition in a school rule.
💡 Explicación
'Must not' and 'need not' are different: 'must not' forbids, while 'need not' merely says an obligation does not exist.
Pregunta 13
Pregunta 13 · D4Bloom: Apply
A student changes from a listening task to a written support after a first attempt.
I ____ understand the recording, so I will read the transcript.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: A)cannot
💡 Explicación
The explanation for changing method is a limitation of ability or comprehension, which 'cannot' expresses and the other three do not.
Ver respuesta
Respuesta correcta: A)cannot
A)cannotCorrect! 'Cannot' states a real lack of comprehension.
B)must not'Must not' forbids an action, and no prohibition is mentioned.
C)should not'Should not' gives advice against listening again.
D)need not'Need not' removes an obligation and would not explain the change of method.
💡 Explicación
The explanation for changing method is a limitation of ability or comprehension, which 'cannot' expresses and the other three do not.
Pregunta 14
Pregunta 14 · D4Bloom: Analyze
A teacher prepares instructions for a group that has just started an English course.
The new students ____ read the instructions in English yet, so the teacher explains them twice.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: B)cannot
💡 Explicación
'Yet' at the end of the first clause marks an expected development that has not happened, which is a statement about a missing ability.
Ver respuesta
Respuesta correcta: B)cannot
A)must not'Must not' forbids an action, which is not described here.
B)cannotCorrect! 'Cannot' states that the ability is absent, and the teacher's repetition is the consequence.
C)should not'Should not' would give advice, but the sentence reports a lack of skill.
D)need not'Need not' removes an obligation and would not explain the teacher's behaviour.
💡 Explicación
'Yet' at the end of the first clause marks an expected development that has not happened, which is a statement about a missing ability.
Pregunta 15
Pregunta 15 · D4Bloom: Apply
A student describes a physical limitation that training did not remove.
Even after two years of training, Pedro ____ hear a very high note without a hearing aid.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: C)can
💡 Explicación
The modal describes a capacity that is still absent in the present, so the negative of 'can' is the only form that fits.
Ver respuesta
Respuesta correcta: C)can
A)could'Could' would place the limitation in the past, and it still holds now.
B)may'May' expresses a possibility of hearing it, and no uncertainty is described.
C)canCorrect! 'Cannot', contracted in the negative, states the permanent limitation of his hearing.
D)must'Must' would express an obligation, which is not the point of the sentence.
💡 Explicación
The modal describes a capacity that is still absent in the present, so the negative of 'can' is the only form that fits.
Pregunta 16
Pregunta 16 · D4Bloom: Evaluate
A group of students is on a school trip near an open beach.
You ____ swim in the sea during a storm, which is clearly dangerous.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: D)should not
💡 Explicación
'Should not' is the modal of advice. When the risk comes from a bad decision rather than from a physical limit, advice is the correct choice.
Ver respuesta
Respuesta correcta: D)should not
A)cannot'Cannot' would state an impossibility, but a storm does not make swimming physically impossible.
B)must'Must' would state an obligation to do it.
C)need not'Need not' would say the action is optional, which hides the risk.
D)should notCorrect! 'Should not' gives advice against the action, and the danger is what makes the advice necessary.
💡 Explicación
'Should not' is the modal of advice. When the risk comes from a bad decision rather than from a physical limit, advice is the correct choice.
Pregunta 17
Pregunta 17 · D4Bloom: Evaluate
A teacher comments on a student who has revised carefully for a test.
You have studied the grammar, so you ____ be able to solve the exercise.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: A)should
💡 Explicación
'Should' plus an infinitive expresses what is probable given the evidence. It is the modal of deduction, not of obligation.
Ver respuesta
Respuesta correcta: A)should
A)shouldCorrect! 'Should' expresses a reasonable expectation based on the effort made.
B)must'Must' would state a logical certainty, which is too strong.
C)can'Can' states an ability, but the sentence is reasoning about an expected result.
D)will'Will' would predict the future without the modal reasoning of expectation.
💡 Explicación
'Should' plus an infinitive expresses what is probable given the evidence. It is the modal of deduction, not of obligation.
Pregunta 18
Pregunta 18 · D3Bloom: Apply
A school organises a graduation ceremony in its main hall.
The hall ____ hold five hundred people, but the school booked only two rooms.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: B)can
💡 Explicación
Capacity of a place is expressed with 'can'. The second clause changes the plan but not the capacity of the building.
Ver respuesta
Respuesta correcta: B)can
A)may'May' expresses permission, and capacity is not permission.
B)canCorrect! 'Can' states a physical capacity of the building in the present.
C)must'Could' would place the capacity in the past.
D)could'Must' would express an obligation about the booking.
💡 Explicación
Capacity of a place is expressed with 'can'. The second clause changes the plan but not the capacity of the building.
Pregunta 19
Pregunta 19 · D4Bloom: Analyze
A teacher explains why a reading activity requires shared materials.
____ the new students all have dictionaries, they cannot check a single word.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: C)Unless
💡 Explicación
The main clause carries the modal 'can' in a negative form, and 'unless' is the conditional that produces exactly that situation.
Ver respuesta
Respuesta correcta: C)Unless
A)Although'Although' would need a contrast, and the second clause supports the first.
B)Because'Because' would give a reason, but the first clause is the condition, not the reason.
C)UnlessCorrect! 'Unless' states the condition without which the negative result in the main clause would not be true.
D)So that'So that' introduces a purpose, and no goal is mentioned.
💡 Explicación
The main clause carries the modal 'can' in a negative form, and 'unless' is the conditional that produces exactly that situation.
Pregunta 20
Pregunta 20 · D5Bloom: Analyze
A boarding school states its evening regulation.
No student ____ stay out after ten o'clock without written permission.
Elige una opción para comprobar tu respuesta.
Respuesta correcta: D)may
💡 Explicación
'May' is the modal of permission, so its negative expresses the removal of that permission. The presence of the word 'permission' confirms the choice.
Ver respuesta
Respuesta correcta: D)may
A)can'Can not' would describe an inability, but a curfew is about permission.
B)could'Could' would place the permission in the past.
C)must'Must not' states a prohibition too, but the pair 'may ... permission' in the sentence is the matching collocation.
D)mayCorrect! 'May not' expresses a rule that forbids the action, and 'may' gives permission in its affirmative form.
💡 Explicación
'May' is the modal of permission, so its negative expresses the removal of that permission. The presence of the word 'permission' confirms the choice.
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