英语的主动句改为被动句,八种时态各一句再加一句情态动词的

被动语态的构成：be + P.P.( done )
① 一般现在时的被动语态：am∕is∕are + P.P.
The classroom is cleaned by the students every Friday .
② 一般过去时的被动语态：was∕were + P.P.
That tree was cut down by them last night.
③ 一般将来时的被动语态：will∕shall + be + P.P.
These pictures will bw sent to the museum next week .
④ 过去将来时的被动语态：would∕should + be + P.P.
They said that the piano would be delivered to your house soon .
⑤ 现在进行时的被动语态：am∕is∕are + being + P.P.
The house is being painted by Tom.
⑥ 过去进行时的被动语态：was∕were + being + P.P.
The bridge was being repaired by the workers this time last Sunday.
⑦ 现在完成时的被动语态：have∕has + been + P.P.
All the flowers have been watered by the farmer.
⑧ 过去完成时的被动语态：had + been + P.P.
Tom said that work had been finished.
⑨ 情态动词的被动语态：情态动词 + be + P.P.
These flowers must be watered every day .