参考下吧：

1.一般现在时的被动语态构成：is / am / are + 及物动词的过去分词

Our classroom is cleaned everyday.

I am asked to study hard.

Knives are used for cutting things.

2.一般过去时的被动语态构成：was / were + 及物动词的过去分词

A new shop was built last year.

Dinosaur eggs were laid long long ago.

3.现在完成时的被动语态构成：has / have + been +及物动词的过去分词

This book has been translated into many languages.

Many man-made satellites have been sent up into space by many countries.

4.一般将来时的被动语态构成：will/shall+ be + 及物动词的过去分词

A new hospital will be built in our city.

Many more trees will be planted next year.

5.含有情态动词的被动语态构成：情态动词+ be + 及物动词的过去分词

Young trees must be watered often.

Your mistakes should be corrected right now.

The door may be locked inside.

Your homework can be handed in tomorrow.

6.现在进行时的被动语态构成：am / is / are + being +及物动词的过去分词

Uncle Wang is mending my bike now.→

My bike is being repaired by Tom now.

They are planting trees over there. →

Trees are being planted over there by them.

7.不定式的被动语态：to + be + 及物动词的过去分词

There are two books to be read. →

There are twenty more trees to be planted.

8.过去将来时的被动语态：would /should+ be + 及物动词的过去分词

He said he would finish the work soon.

He said the work would be finished soon by him.

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