1、一般现在时的被动语态【例句】1. Our classroom is cleaned by us every day.2. Workers are needed very much here.3. This English song is not often sung by us.4. Is your grandpa taken care of by that nurse?5. When are trees often planted?【探秘】★ 一般现在时的被动语态表示经常性、习惯性的被动动作，由“主语(动作承受者)+ is / am / are + 及物动词的过去分词(+ by +
2、 动作执行者)”构成，常与now, every day, often, usually, always, never等连用。温馨提示：判断该不该用被动语态主要看主语是否为谓语动词所表示的动作的承受者。★ 一般现在时的被动语态句型变换紧紧扣住助动词is，am或are进行：否定句在is，am或are后面加not；一般疑问句将is，am或are提至句首。一般过去时和一般将来时的被动语态 【例句】1. Those novels were written by Mo Yan.2. The window wasn’t broken by Jim.3. Was the bridge started
3、 last month?4. Mary will be given a gold medal.5. The machine won’t be checked today.6. Will the classroom be decorated before the festival?7. A basketball match is going to be held this Saturday.8. These trees are not going to be cut down.9. Is the wall going to be painted by the workers?【探秘】1
4、. 通过例句1~3可以看出，一般过去时被动语态的结构为“主语 + was / were + 及物动词的过去分词(+ by + 动作执行者)”；否定句是在was / were后加not；一般疑问句将was / were提前。2. 通过例句4~9可以看出，一般将来时被动语态的结构为“主语 + will be + 及物动词的过去分词(+ by + 动作执行者)”或“主语 + am / is / are going to be + 及物动词的过去分词(+ by + 动作执行者)”；否定句是在will或am / is / are后加not；一般疑问句将will或am / is / are提前。
5、含有情态动词的被动语态 Teenagers should be allowed to go out with their friends every night. 【要点讲解】 含有情态动词的被动语态结构为：情态动词(should, must, may, can, could等) + be +及物动词的过去分词。其否定形式是在情态动词后面加not，疑问形式是将情态动词提前。如：Many more trees should be planted this year.The books can’t be taken out of the reading room.Must the wor
6、k be finished by 6:30 pm? 【活学活用】 将下列句子改为被动语态。 You should brush your teeth before you go to bed.Your teeth before you go to bed. Key: should be brushed【例句】 1. The window has been closed by my father. 2. Those dirty clothes haven’t been washed. 3. Have many factories been bu
7、ilt in your hometown? 4. Junior high school students should be encouraged to go to school by bike. 5. These magazines can’t be taken out of the reading room. 6. Must the old man be sent to hospital?【探秘】1. 通过例句1~3可以看出，现在完成时被动语态的
