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1、 情态动词拔高课（讲义）一、情态动词基本特征I can play the drums very well.She must spend an hour reading English every day. That boy may be Lindas brother.情态动词属于 ，不能单独构成谓语，后面要接动词，并且只能接 。没有人称，时态和数的变化。用来表达说话人的情绪，态度或语气。练习：()What can she do?She can _ guitar.A. playB. play theC. plays theD. playing()The girl in red maymy old
2、 friend, Jane.A. amB. isC. beD. are () Maryat home tonight because she a lot of clothes to wash.A. may; hasB. may be; haveC. must; hasD. may be ; has二、句式转换I can swim so I want to join the swimming club. I cant go to the cinema with you tomorrow.Can you play the guitar?含有情态动词的句子，变否定句时直接在 后加not；变为一般疑问
3、句时，把 提到句首。练习：He can stay for dinner tonight.（变为一般疑问句）I may go to the countryside next month.（变为否定句）My friend can join the music club.（就划线部分提问）We must arrive in Henan tomorrow.（就划线部分提问）10三、情态动词总结can1. 能够，会My sister can speak English quite well. But I cant speak English at all.can 可以用来描述某人具有某种 。2. 可以Y
4、ou can go home now.You can take this book away if you like it.can 可以用来表示一种_ 。3. 可以吗？Can you pass me s piece of paper?Can I stay at my friends home tonight?can 可以用来表示 ，并且通常对于关系亲近的人。肯定回答用 Yes, sb can. 否定回答用 No, sb cant.could1. 能够，会I could ride the bicycle when I was seven. He could swim when he was a
5、little child.用来描述某人具有某种能力，用于 。The little girlspeak French very well.Ispeak a few French when I was young, but I forget all now.2. 可以吗Could you help me move the heavy box? Could I have a look at your family photos?could 可以用来表示 ，口气比 can 委婉。回答时，与 can 相同肯定回答用 Yes, sb can. 否定回答用 No, sb cant. ()Could I bo
6、rrow your ruler, please?Yes, you _. But you must return it before lunchtime.A. have toB. canC. mustD. couldneedTina needs to get some sleep.I dont need to go home yetits still early. He needed to finish the work yesterday.need 作实义动词，有人称，时态的变化。接动词时，用动词不定式。Need I come here before eight tomorrow mornin
7、g?No, you neednt.need 也可作情态动词，常用于否定句和疑问句中，neednt 翻译为“没必要”。练习：判断下列句子中的 need 属于实义动词还是情态动词Andy needs to have a rest. Need I pay him a visit? You neednt get here so early. must v. 必须Tom, you must listen to your teacher at school. We must stop when the traffic light is red.I must keep the habit of going
8、to bed early.must 常用来表达一种 或者一种 。have to “不得不，必须”Do you want to play basketball with us after school?Id love to, but I have to finish my homework first. I had to leave at that time.（变为否定句）She has to look after her little brother today.（变为一般疑问句） must & have to区别 1：must 多表示主观需要或责任感的驱使有必要或有义务去做某事，多译为“ ”
9、，而 have to 除了表示必须，也可表示环境所限，客观要求( 无奈) 而为之，多译为“ ”。You must be here on time tomorrow.I must get up early to catch the first train.I cant go out with you because I have to do my homework now.I have to leave school because my family is very poor.区别 2： 没有人称，时态的变化； 有人称，时态的变化。区别 3：否定形式的含义不同must 的否定形式 mustnt
10、 表示“禁令”，译为“禁止，绝对不能”；have to 的否定形式 dont have to 译为“没必要”。Children mustnt swim in the river.You dont have to take a taxi. It is still early.联系：Must I hand in the homework now?Yes, you must/have to.No, you dont have to/neednt.must 提问的一般疑问句，肯定回答用 must 或者 have to；肯定回答用 dont have to 或者 neednt.()Must I be i
11、n hospital for a week, Doctor?No, you . You can go back home tomorrow.A. cantB. mustntC. needntD. mustmay1. “可能，也许”表达一种可能性I may visit my grandparents on Sunday, but I am not sure yet.I cant find my watch.It may be in your schoolbag.2. “可以”You may take this away if you like it. You may have your lunc
12、h now.3. “可以吗？好吗？”May I use your telephone? May I come in?may 表示委婉请求时，常与第一人称连用。语气比 can，could委婉。肯定回答用 Yes, sb may. 否定回答用No, you cant 或者No, you mustnt.()May I smoke here?Im sorry you . It is dangerous to smoke here.A. needntB. canC. mayD. mustnt may be & maybeShe may be at home now.Maybe she wants to
13、go to movies with you today.may be：may 后要接动词原形。am，is，are 的原形为 be。maybe：是一个副词，意思是“也许，可能”。常放在句首。()Will you answer the telephone? Ityour mother.A. can beB. may beC. have to beD. maybe四、课堂练习()1. What must your brother do every day?He mustpiano.A. practice playB. practices playC. practice playingD. pract
14、ices playing ()2. Can your brother drive? . He often drives me to work.A. Yes, he canB. No, he cantC. Yes, he drivesD. No, he doesnt drive ()3. They _ play football last Fridaybecause Simon forgot to bring his football here.A. couldB. couldntC. cantD. can ()4. Could I have another cup of coffee?Yes, of course you .A. canB. cantC. couldD. couldnt ()5. Lisa is a little poor at Chinese. I think sheneedsit every day.A. practice to speakB. to practice speakingC. practice speakingD. to practice to speak ()6.Lets take a taxi.No, we . Its not far from here.A. cantB. mustntC. couldntD.
