The passive (present simple, past simple, will)

statement

negative

question

Helpful hints

• Look at the active sentence. The verb is stole and the object is my sister's bike.

• The object of the active sentence (my sister's bike) becomes the subject of the passive sentence.
My sister's bike ...

• Then we need the verb be in the same tense as the verb in the active sentence. Here, stole is past simple, so we need was.
My sister's bike was ...

• Then we need the past participle of the verb in the active sentence. The past participle of steal is stolen.
My sister's bike was stolen ...

• Finally, we finish the sentence in the right way.
My sister's bike was stolen yesterday.

Watch out!

• When the verb in a passive sentence is a phrasal verb, don’t forget to include the particle.
They picked up the broken glass.  →  The broken glass was picked up.

Some verbs have irregular past participle forms.