原创中考英语总复习之情态动词课件（PPT35张）

课件35张PPT。2018.5.16原创中考英语总复习之情态动词Modal verbs一、基本概念：
情态动词是表示可能、怀疑、愿望、许诺、猜测等语气的动词。二、 情态动词的基本用法
情态动词表示说话人的语气和情绪，其本身词义不完整，不能单独作谓语，必须加上动词原形一起才能构成谓语。情态动词没有人称和数的变化（have to 除外），有些情态动词有过去式。常见的情态动词有can, could, may, might, must, have to, shall, should, will, would, ought to, need, dare等。含情态动词句型基本结构陈述句 ： 主语+情态动词+ 动词原形
We should study hard.
一般疑问句 ： 情态动词+主语+ 动词原形
Can you help me?
特殊疑问句：特殊疑问词+情态动词+主
语+动词原形
What should I do? 考纲情态动词用法详解1、can与could的用法
1）.表示能力(could 指过去曾经的能力)。
She can play chess.
He could drive before.
2).表示客观上或理论是的可能性。
It can rain heavily here, especially in summer.
3).表示请求、建议、允许、许可用could
比 can语气更委婉,回答用原形。4).表示推测“可能”(用于疑问句和否定句)
Could you tell me how I can get to the zoo? She can’t be our headmaster. She has gone to America.
2. may/might1).表示请求、允许、许可, might比may的语气更委婉.—May I use the car ?
—I’m afraid not. 2).表示推测“可能”, could的可能性比can小。 It might not be Jane. She hasn`t dicided to come here yet. 3.must 1）.表示“必须; 应该”We must finish our homework everyday.2）.表示“一定”The book must belong to Jim , there is his name on the cover.2）.表示“硬要；偏要”If you must go home, at least call your mom. 4.will/would1）.表示“请求; 建议”,用于疑问句。would比will委婉、客气.
Will / Would you please open the window? 2）.表示意志或意愿I will help you.He promised that he would do anything for you.3）.表示习惯, will表示现在的习惯, 意为“总是; 习惯于”。would表示过去的习惯性动作.This kind of thing will happen.
这种事情总是要发生的He would stay up late when he was young.4）.表示“注定会”Fish will die without water.5. shall1).用于第一人称和第三人称的疑问句,
表示征求对方的意见.Shall we go out for a walk?Shall he wait for you at school??? 2).用于第二人称和三人称的陈述句, 表示“命令、警告、允诺或威胁”.You shall do as the teacher says.
(表示命令)?You shall receive my money tomorrow.
(表示允诺?)??He shall be sorry for his behavior one day, I tell you.??(表示警告?)??6. should 1)表示劝告和建议, 意为“应该”We should help each other.
You should be polite to the old.2)表示惊讶、意外, 作“竟然”讲To my surprise you should not know about me. 3) 表示可能性很小, 但并非完全不可能，用于if 引导的条件状语从句。If he should be free yesterday, he would come to our party. 4）表示推测，意为“想必一定、照说应该、估计”等。
He should be free by now.??7. ought to1). 表示义务, 作“应当”讲, 语气比should强烈
As a student, you ought to study hard.
You oughtn’t to speak so much.?? ?2). 表示含蓄或不完全肯定的推测, 意为“应该”或“应是”
He ought to know my telephone number.??8. dare. 用于疑问句、否定句和条件状语从句中,表示“敢; 敢于”。She daren`t go alone at night. How dare you come again? Go if you dare.9. need表示“需要; 必要”, 用于疑问句、否定句和条件状语从句。 You needn’t worry about me. Need I give you a hand? Need I help you if you get into trouble?容易混淆的情态动词
用法区别 You needn’t worry about me. You needn’t worry about me. You needn’t worry about me. 情态动词后面跟完成时情态动词+have done的用法
1.对过去的推测1). must have done表示对过去已经发生的行为进行推测, 意为“准是、想必、一定做了某事”, 通常用于肯定句。You must have gone swimming,
for your hair is wet now. 2). may have done 和 might have done 也许、
或许、已经
表示对过去所发生动作的推测, 常用于肯定句或否定句。I’m not sure. He might have invited you.3). can have done 和could have done
表示对过去所发生动作的怀疑和否定, 通常用于否定句和疑问句Where can Tom have gone?
I saw Li Lin playing football just now. He couldn’t have been ill. 2. 表示遗憾、后悔或责备 1). should have done 和 ought to
have done 用于肯定句表示“本该做某事, 而实际上没有做”You should have given her a hand just now. 用于否定句表示“本来不该做的事反而做了”。 You oughtn`t to have invited him.2). might have done
用于肯定句,表示本应该或可以做某事, 带有轻微的责备的语气。You might have helped your mother with housework. 3). could have done 本来可以……
常用于肯定句,表示过去没有实现的可能性。You could have passed the exam, but you were too careless. 4). needn`t have done 用于否定句
表示过去“本来不需要……”You needn’t have worried about me.??
?你本不必为我担心。 情态动词后面跟进行时
情态动词 + be + doing表示“想必正在……”，“可能正在……”，“应当正在”They may be discussing our problem.?She can’t be telling the truth. ?They must be chatting on the Internet.? ?You shouldn’t be working like this.? EXERCISES一、用适当的情态动词填空1. You worry about me. needn’t 2. He looks so pale, he be ill. must 3. Plants die without sunshine. will 4. The red coat be Bob`s , he
doesn`t like red at all. can’t .
5. We learn from each other. 6. Miss Li help me when she
worked at our school.
7. He come to see you again. 8.We help parents with housework. should would daren’t ought to 二、单项选择：1. You fail in the exam without hard working. A. will B. would C. mustn‘t D. can 2. He had to give up smoking because of his illness, he? A. did B. does C. didn’t D. doesn‘t 3. —May I wear jeans to take the party? —Sorry, you ,you should wear a suit. A. needn't B. can't C. may not D. mustn't4. Let`s take a walk, we?　 A. can B. would C. must D. shall A C B D
5. I don`t know if he? play the guitar
before. A. would? B. could??? C. did?? D. had
6. There goes the bell, We'd better speak .
　 　A. not B. not to C. won't D. don't
7. Students tell lies.
A. may not B. must C. can D. mustn`t
8. We? ?follow the rules here.
A. can B. may C. ought?to D. could B A D C 9.You waken me up, it`s Sunday today. A. needn’t have B. must have C. need have D. mustn`t have 10.I?hope?that?everyone? pass the exam. A. can be able to B. will be able to C. would be able to D. are able to 11. — Don't eat in class. —______ A. Yes, I won't. B. Sorry, I can't. C. Sorry, I won't. D.OK,I didn't. A B C THE END ! THANK YOU!