Passive Voice

Respuesta correcta: A) was repaired

• A) was repaired'Was repaired' is the past passive: the auxiliary 'was' plus the participle of the verb.
• B) was repair'Was' must be followed by the past participle 'repaired', not by the base form of the verb.
• C) is repairing'Is repairing' is the present continuous, which cannot describe an event from last winter.
• D) was repairing'Was repairing' is the past continuous and lacks the participle a passive sentence requires.

Respuesta correcta: B) was written

• A) is writing'Is writing' is the present continuous and would need a subject that performs the action.
• B) was written'Was written' is the past passive and fits a letter that Ana wrote and that now sits on the desk.
• C) wrote'Wrote' is the past simple active and cannot be followed by 'by Ana'.
• D) was writeThe past passive needs the past participle 'written', not the bare form 'write'.

Respuesta correcta: C) The bridge was built in 1930.

• A) The engineers built the bridge in 1930.'Built' here is the past simple active, with the engineers performing the action.
• B) The bridge is building in 1930.'Is building' is an active present continuous and does not use the participle.
• C) The bridge was built in 1930.'Was built' is 'be' plus the past participle, so the bridge receives the action.
• D) The bridge has built itself in 1930.A thing cannot build itself; the verb here would need the passive form 'was built'.

Respuesta correcta: D) Mara sang the song.

• A) Mara is singing the song.'Is singing' is the present continuous, which does not match the past event described.
• B) The song sings Mara.That reverses the roles and makes the song perform the action, which makes no sense.
• C) Mara was sung the song.'Was sung' keeps the passive voice and cannot describe Mara as the subject.
• D) Mara sang the song.'Sang' is the past simple of 'sing', so the performer becomes the subject in the active voice.

Respuesta correcta: D) Is

• A) Are'Are' would need a plural subject, but 'the room' is singular.
• B) Do'Do' opens an active present simple question and would take the base verb 'clean'.
• C) Did'Did' opens a past simple question and would require the base form 'clean'.
• D) Is'Is the room cleaned' places 'is' before the subject, as the passive question requires.

Respuesta correcta: C) already

• A) last centuryA finished distant past period normally takes the past simple rather than the present perfect.
• B) every day'Every day' describes a repeated habit and belongs to the present simple.
• C) already'Already' pairs with 'has been' plus participle to report a completed action relevant to now.
• D) in a moment'In a moment' points to the future and needs a future tense.

Respuesta correcta: B) was broken

• A) was breaked'Break' is irregular, so the past participle is 'broken' and never 'breaked'.
• B) was broken'Was broken' is the past passive with the irregular participle 'broken'.
• C) was breaking'Was breaking' is the past continuous, which describes an action in progress.
• D) is breaking'Is breaking' is present tense and does not describe a completed event.

Respuesta correcta: A) have not been signed

• A) have not been signed'Have not been signed' is the negative present perfect passive, which matches 'yet'.
• B) did not signed'Did' must be followed by the base form 'sign', never by the participle 'signed'.
• C) are not signing'Are not signing' is an active present continuous negative, not a passive one.
• D) were not signing'Were not signing' is a past continuous negative and lacks the participle.

Respuesta correcta: B) The results were announced by the principal.

• A) The results were announcing by the principal.'Were announcing' is a past continuous, which cannot form the passive.
• B) The results were announced by the principal.'Were announced' is 'be' plus participle, and 'the results' receives the action.
• C) The results are announce by the principal.'Are announce' lacks the past participle, so the passive structure is incomplete.
• D) The results has announced by the principal.'Has' alone cannot build a passive; a form of 'to be' is required.

Respuesta correcta: D) was sent

• A) is sent'Is sent' is the present simple passive and would place the action in the present.
• B) was sending'Was sending' is the past continuous, which cannot form the passive.
• C) has sent'Has sent' is the present perfect active with 'the letter' as the sender.
• D) was sent'Was sent' is the past simple passive: 'was' plus the participle 'sent'.

Respuesta correcta: C) be invited

• A) invite'To invite' is the active infinitive and would make him the one doing the inviting.
• B) to invitedA double 'to' is not possible; the infinitive marker plus 'be' gives 'to be invited'.
• C) be invited'To be invited' is the passive infinitive, with the subject receiving the invitation.
• D) being invited'Being invited' is a gerund phrase and cannot follow 'wants to' in that position.

Respuesta correcta: A) The photos were taken by my brother.

• A) The photos were taken by my brother.'Were taken' is 'be' plus participle, and 'the photos' receives the action.
• B) The photos were take by my brother.'Were take' uses the base form instead of the participle 'taken'.
• C) The photos have take by my brother.'Have' alone cannot build a passive, and 'take' is not the participle here.
• D) The photos are take by my brother.'Are' would need the participle 'taken' to form a correct present passive.

Respuesta correcta: D) The students finished the project early.

• A) The project was finished early.'Was finished' is 'be' plus participle, so this sentence is passive.
• B) The project has been finished early.'Has been finished' contains a form of 'be' plus participle, so it is passive.
• C) The project is being finished now.'Is being finished' is the present continuous passive.
• D) The students finished the project early.'Finished' here is the past simple active, with the students performing the action.

Respuesta correcta: B) must be taken

• A) must takingA modal verb never takes the -ing form directly after it.
• B) must be takenModal plus 'be' plus participle gives 'must be taken', which fits a medical instruction.
• C) must taken'Taken' alone cannot follow a modal; the auxiliary 'be' is required.
• D) must be take'Be' must be followed by the past participle 'taken', not by the base form.

Respuesta correcta: A) will have been solved

• A) will have been solved'Will have been solved' places the completion before a future deadline in the passive.
• B) will solve'Will solve' is the future simple active and needs a subject that does the solving.
• C) has solved'Has solved' is the present perfect active and links the past to the present.
• D) is solving'Is solving' is the present continuous active and describes an action in progress.

Respuesta correcta: C) The school was built in 1960.

• A) The school is built in 1960.'Is built' is the present simple passive and does not match the past year given.
• B) The school was building in 1960.'Was building' is the past continuous and cannot describe a completed construction.
• C) The school was built in 1960.'Was built' is 'be' plus participle, and the school becomes the subject receiving the action.
• D) The school built in 1960.'Built' as a main verb leaves the sentence without an auxiliary and gives no passive.

Respuesta correcta: B) being locked

• A) locking'Locking' is the active gerund and would make the subject the one who locks the door.
• B) being locked'Being locked' is the gerund passive, describing the door receiving the action in the past.
• C) locked'Locked' is the past participle alone and cannot stand after 'remember' in this form.
• D) to being lockedA double infinitive marker is not possible after the verb 'remember'.

Respuesta correcta: A) Was

• A) Was'Was the money stolen' places the auxiliary before the subject, as a passive question requires.
• B) Did'Did' opens an active past simple question and would take the base verb 'steal'.
• C) Has'Has' would build a present perfect and would need 'the money' followed by 'been stolen'.
• D) Do'Do' opens a present simple question and does not match the past participle 'stolen'.

Respuesta correcta: C) The letter was written by Ana and it was sent yesterday.

• A) The letter was wrote by Ana and it was sent yesterday.'Was wrote' uses the past simple instead of the participle 'written'.
• B) The letter wrote by Ana and it was sent yesterday.'Wrote' with no auxiliary leaves the first clause active and incomplete.
• C) The letter was written by Ana and it was sent yesterday.Both 'was written' and 'was sent' are past passives with participle verbs.
• D) The letter was written by Ana and it sent yesterday.'Sent' with no auxiliary leaves the second clause without a passive verb.

Respuesta correcta: D) has not been cleaned

• A) has not clean'Has not clean' uses the base form instead of the participle 'cleaned'.
• B) did not cleaned'Did' cannot be followed by a participle, and it marks a finished past action.
• C) is not cleaning'Is not cleaning' is the present continuous and lacks the participle.
• D) has not been cleaned'Has not been cleaned' is the negative present perfect passive and matches 'yet'.