1.一般現(xiàn)在時(shí)的被動(dòng)語態(tài)構(gòu)成：is / am / are + 及物動(dòng)詞的過去分詞
Our classroom is cleaned everyday.
I am asked to study hard by my mother.
Knives are used for cutting things.
2.一般過去時(shí)的被動(dòng)語態(tài)構(gòu)成：was / were + 及物動(dòng)詞的過去分詞
A new shop was built last year.
Dinosaur eggs were laid long long ago.
3.現(xiàn)在完成時(shí)的被動(dòng)語態(tài)構(gòu)成：has / have + been + 及物動(dòng)詞的過去分詞
This book has been translated into many languages.
Many man-made satellites have been sent up into space by many countries.
4.一般將來時(shí)的被動(dòng)語態(tài)構(gòu)成：will+ be + 及物動(dòng)詞的過去分詞
A new hospital will be built in our city.
Many more trees will be planted next year.
5.含有情態(tài)動(dòng)詞的被動(dòng)語態(tài)構(gòu)成：情態(tài)動(dòng)詞+ be + 及物動(dòng)詞的過去分詞
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.現(xiàn)在進(jìn)行時(shí)的被動(dòng)語態(tài)構(gòu)成：am / is / are + being + 及物動(dòng)詞的過去分詞
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.不定式的被動(dòng)語態(tài)：to + be + 及物動(dòng)詞的過去分詞
There are two books to be read.→
There are twenty more trees to be planted.