to be is changed according to the tense and the subject :
Present Simple: to be = am / is / are
I am always asked to look after his dog.
Past Simple: to be = was / were
I was asked to look after his dog yesterday.
Future Simple: to be = shall / will be
I shall be asked at the next lesson.
They built the church in the 18 –th century.
The church was built in the 18 – th century by them.
If you want to say who did it or what
caused the action, use BY .
If you want to change the sentence from Active into Passive, you must:
The Operetta Theatre
The Yury Nikulin Old Circus
The Moscow Dolphinarium
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