Question

Change the voice.they repaired the building last year

Answer 1

Explanation:

The sentence is already in passive voice. The identity of passive voice is 'a form of “to be” immediately followed by a past participle’ . In the given sentence, 'had to be' is followed by 'built', which is the past participle of the verb 'build' . This clearly indicates passive voice. Therefore it can't be further transformed into passive voice. If you want to change the voice of the sentence, you have to make it active. It will be as follows:

“They (or we/you/ the officer/the government etc.) had to build the bridge.

Answer 2

Answer:

Last year they repaired the building .