s calledРР第2页РРThe pet dog ________________(treat) by veterinary.Рis being treatedРР第3页РРA frog __________ ( catch) by a big bird just now.Рwas caughtРР第4页РРI ______________ (move) by the brave astronauts Fei Junlong and Lie Haishen.Рhave been movedР第5页РРbe + doneРThe passive voiceРР第6页РРam/is/are? 普通现在时Рam/is/are+being?现在进行时Рshall/will+be?普通未来时Рhave/has+been?现在完成时Р+ doneРbeРР第7页РР+ doneРwas/were? 普通过去时Рwas/were+being?过去进行时Рwould+be?过去未来时Рhad+been?过去完成时РbeРР第8页РРWhen do we use the passive voice ?РMany houses will be built here.Р1. 不知道或没必要指出动作执行者。РThe song “ The East is Red” was written by a poor peasant.Р2. 强调动作承受者。РРР第9页РРThe plan was supported by those who wished to have more chances to speak English.Р3. 动作执行者有较长修饰语。РYou are requested to attend the meeting.Р4. 出于礼貌，不愿意说出动作执行者。РР第10页
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