be+過去分詞(如done\gone)
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.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.8.過去完成時(shí)的被動(dòng)語態(tài)：would + be + 及物動(dòng)詞的過去分詞 He said he would finish the work soon.He said the work would be finished soon by him.