Upper-intermediate grammar exercise: past passive tenses

English grammar practice exercise, upper-intermediate / advanced level.

This exercise focuses on the past passive tenses.

Change the sentences below into the correct passive tense.

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Structures of past tense passive forms
past simple passive

I was told about it yesterday.
present perfect passive

He's (he has) been fired from the company.
past perfect passive

I'd (I had) been given the money by a friend.
past continuous passive

The room was being decorated.