語態(tài)：主動語態(tài)：表示主語是動作的執(zhí)行者
被動語態(tài)：表示主語是動作的承受者
一般現(xiàn)在時的被動語態(tài)：助動詞is/am/are+P.P.(過去分詞）
The Olympic Games is held once ever four years.
一般過去時的被動語態(tài)：助動詞was/were+P.P.
The bridge was built in 1995.
一般將來時的被動語態(tài)：助動詞will+be+P.P.
The teaching building will be put up next year.
過去將來時的被動語態(tài)：助動詞would+be+P.P.
現(xiàn)在進行時的被動語態(tài)；助動詞is/am/are+being+P.P.
A new factory is being built in our town.
現(xiàn)在完成時的被動語態(tài)：助動詞have/has+been+P.P.
He has been sent to work in Tibet.
情態(tài)動詞的被動語態(tài)；情態(tài)動詞+be+P.P.
Your homework must be finished as soon as possible.
Teenager should not be allowed watch TV every night.
過去進行時的被動語態(tài)：助動詞was/were+being+P.P.
When I got home ,dinner was being cooked by mother.