Question

They had to build the bridge. change into passive voice

Answer 1

The bridge had to be built by them .

Answer 2

Active:- They had to build the bridge.

Passive :- The bridge had to be built by them.

Or The bridge had to be built.

You can omit "By them".

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$\boxed{\bf{Remember}}$

✔ The doer of the active voice becomes the object of the passive voice.

✔ The object of the active voice changes into doer of passive voice.

$\bf{For\:example}$ :- Someone told me to keep the books. Here "Someone" is doer, but when we are changing it into passive voice, it is the object and the same applies vice-versa.


✔ Verb is always in its 3rd form.

✔ Sentence are changed such that the tense doesn't change.