情态动词。
情态动词的定义：表示说话人对某一动作或状态的态度。
情态动词的特点：
1. 后接动词原形 2. 没有人称和数的变化。
3. 变否定句直接加not. 4. 变一般疑问句直接将情态动词提前。
常用的情态动词：can/could, may/might, will/would, shall/should,
must, need, etc. (注意：need有两种用法)
情态动词的用法：
1. can 和could的用法
表示能力。（could可作为can的过去）
eg. she __speak english now. /she __speak english at the age of five.
表示可能性。（对现在可能发生事情的推测）
eg. anybody __make mistake. /he __be at home. (否定推测)
3) 表示请求。（could比can更委婉）
eg. _i use your roomi use your room? (更委婉)
2. may 和might的用法。
表示请求。（might比may语气更委婉。）
eg. _i use your dictionary.
表示可能性。
eg. he __be right.
表示祝愿。
eg. _you successall your dreams come true.
3. will (won’t) 和shall (shan’t) 的用法：
表将来：will可用于各种人称，而shall 只能用于第一人称i/we.
shall用在一般疑问句中表示提建议。
eg. jane __join in the long jump, while itake part in the high jump.
we go for a picnic this weekend?
---good idea!
4. must的用法。
表示必须。（否定式mustn’t表示“禁止”。）
eg. youreturn it to me. /yousmoke in the office.
表示肯定的推测（一般用于肯定句中）
eg. the light is still on, so he __be at home. （对现在肯定的推测）
i saw him just now, so hebe in london. (对现在否定的推测)
注意：1 在回答包含must的问句时，若是肯定回答可用must;若为否定回答，用needn’t或don’t h**e to,表示“不必”。
eg. must i take my camera ?
---yes,you __
--no,youno,you
2 must和h**e to的区别：两者都有“必须”之意。
但must表示说话人的主观意志，h**e to表示客观的需要。
eg. you must stay at home tonight. /i h**e to stay at home tonight.
5. need的用法。
1 作情态动词用表示“需要”。(拥有情态动词所有特点)
eg. sheclean the classroom. /sheclean the classroom.(否定)
2 作实义动词用表示“需要”。（此时 need就像其他动词一样，有人称和数的变化，固定搭配：need to do sth.）
part in the sports meet.
shetake part in the sports meet. (否定)
半情态动词：h**e to (具有以下特征：)
eg. my momcook for us every day. (我妈妈每天得为我们做饭)
hecook himself. (他不用自己做饭。)
随堂练习。一。 句型转化。
1. -must i finish my homework now?(作否定回答)
---nono
2. kangkang need clean the classroom himself.(变否定句)
kangkangthe classroom himself.
3. jack has to return this book this friday. (变否定句)
jackreturn this book this friday.
4. my friend will cook a big dinner the day after tomorrow.(划线提问)
your friend __the day after tomorrow?
can play baseball now.(用three years ago改写)
shebaseball three years ago.
二．用适当的情态动词填空。
1. igo climbing with my father tomorrow afternoon. i’m not sure.
2. younot) play with knives. ithurt you..
3. youfinish your himework before you play computer games.
4. wesay no to drugs.
5. younot) take your camera there. mike __take his.
6. inot) do this work myselfyou help me?
7. henot) be there now. i saw him crossing the street ten minutes ago.
8you be happy forever.
9we take more warm clothes with us?
10. listen! there is someone singing in the room.
thatbe tina. she likes singing best.
三．选择正确答案。
1. -i hear you got a new phonei h**e a look?
---yes, certainly.
a. mayb. doc. shalld. must
2. -i can't stop playing computer games.
---for your eyes, my dear friend, i’m afraid you
a. mayb. canc. mustd. will
3. -mum, must i stay there the whole day?
---no, youyou __come back after lunch, if you like.
a. mustn’t; can b. needn’t; must c. mustn’t; should d. needn’t; may
4. -is maria knocking at the door?
---itbe her. she is in australia now.
a. may notb. needn’tc. mustn’t d. can’t
5. -may i play computer now?
---no, you
a. must not b. may notc. don't h**e to d. shouldn’t
6. his mother is ill today. so he __to stay at home to look after her.
a. mayb. mustc. h**e tod. has to
7.--i __take part in the long jump this weekend.
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