情态动词
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课件12张PPT。Revision for Modal Verbs 1●The basic uses of Modal Verbs 11. Can Could 过去式；语气更委婉Can 表示习惯能力，
而be able to表示经过那里而做成了某事。
2. 在否定结构中，二者可以互换。1.在否定、疑问句中表示“对过去发生行为
的可能性猜测。
2. 在肯定句中表示“本来可以做而未做”The door was locked. She couldn’t have been at home.
You could have been more careful.11. May Might 过去式；语气更委婉1.在否定、肯定句中表示对过去动作的推测
“也许是……”
2. Might+have+p.p表示虚拟，表“劝告、责备之意。”Eg. 1. She may be still waiting for us.
2. May I come in?
3.May you have a happy holiday.Eg.
1. He might have spoken to her yesterday.
2. You might have told me earlier.11. Must 表示肯定的猜测,但只用于肯定句，
而mustn’t 表示“禁止、不准”Must表示主观
Have to表示客观需求
Have got to 多见于口语3. must + have +p.p对过去事情的肯定猜测。Eg.
The road id wet. It must have rained last night.11、Shall /should 2、shall/should
+ have +p.p
ought to表示本应该做而未做。should 过去式
语气更委婉Eg.
You should have been five minutes ago.1Will/ would 1、Would 后只能接表示动作的动词。2、used to 则还可以接表示状态的动词。
Eg.
He used to be a worker.11、情态动词用于否定、疑问句；条件从句中。
eg.
1. Dare you go here alone?
2. How dare you do such follish things?
3. I won’t allow you to swim in the river,
even if you dare do it.Dare / dared2 、做实意动词后加不定式。
eg.
I have never dared to tell him about it.1Need /needed 1、情态动词用于否定句，疑问句。2、实意动词用法似dare,用作不定式。3、need + not + have +p.p
表示“本来不需要做而做了。1Ought to 1、其否定式为ought not to2、ought to + have + p.p
表示本来应该做而没有做到。Eg.
You ought not to have cut away the trees around the old building.1三点说明1、情态动词 + v 表示对现在或将来动作的猜测。
情态动词 + have + p.p表示对过去动作的猜测。2、情态动词的过去式与原形相比，多点礼貌，少点冒昧，
语气更为委婉。情态动词在一般疑问句中的回答：
① Can you sing?
② May I come in?
③ Must I handin the book now?
④ Need I finish it now?1典型错误1. He mustn’t be in the classroom. ( )Can’t2. You might leave the bag on the bag. ( )might have left3. You must have seen the film last week, have’t you?
( )didn’t you 4. Li ming must have been to Japan, didn’t he? ( )hasn’t he1
而be able to表示经过那里而做成了某事。
2. 在否定结构中，二者可以互换。1.在否定、疑问句中表示“对过去发生行为
的可能性猜测。
2. 在肯定句中表示“本来可以做而未做”The door was locked. She couldn’t have been at home.
You could have been more careful.11. May Might 过去式；语气更委婉1.在否定、肯定句中表示对过去动作的推测
“也许是……”
2. Might+have+p.p表示虚拟，表“劝告、责备之意。”Eg. 1. She may be still waiting for us.
2. May I come in?
3.May you have a happy holiday.Eg.
1. He might have spoken to her yesterday.
2. You might have told me earlier.11. Must 表示肯定的猜测,但只用于肯定句，
而mustn’t 表示“禁止、不准”Must表示主观
Have to表示客观需求
Have got to 多见于口语3. must + have +p.p对过去事情的肯定猜测。Eg.
The road id wet. It must have rained last night.11、Shall /should 2、shall/should
+ have +p.p
ought to表示本应该做而未做。should 过去式
语气更委婉Eg.
You should have been five minutes ago.1Will/ would 1、Would 后只能接表示动作的动词。2、used to 则还可以接表示状态的动词。
Eg.
He used to be a worker.11、情态动词用于否定、疑问句；条件从句中。
eg.
1. Dare you go here alone?
2. How dare you do such follish things?
3. I won’t allow you to swim in the river,
even if you dare do it.Dare / dared2 、做实意动词后加不定式。
eg.
I have never dared to tell him about it.1Need /needed 1、情态动词用于否定句，疑问句。2、实意动词用法似dare,用作不定式。3、need + not + have +p.p
表示“本来不需要做而做了。1Ought to 1、其否定式为ought not to2、ought to + have + p.p
表示本来应该做而没有做到。Eg.
You ought not to have cut away the trees around the old building.1三点说明1、情态动词 + v 表示对现在或将来动作的猜测。
情态动词 + have + p.p表示对过去动作的猜测。2、情态动词的过去式与原形相比，多点礼貌，少点冒昧，
语气更为委婉。情态动词在一般疑问句中的回答：
① Can you sing?
② May I come in?
③ Must I handin the book now?
④ Need I finish it now?1典型错误1. He mustn’t be in the classroom. ( )Can’t2. You might leave the bag on the bag. ( )might have left3. You must have seen the film last week, have’t you?
( )didn’t you 4. Li ming must have been to Japan, didn’t he? ( )hasn’t he1