必修三unit2 Grammar 教案

教学重点

1. Get students to review and consolidate the use of can, could, may, might, will, would, shall, should, must, can’t.，ought to. 教学难点

Enable students to learn how to use ought to correctly. 三维目标 知识目标

1. Get students to know more about modal verbs. 2. Let students learn the use of ought to. 能力目标

Enable students to use modal verbs correctly and properly according to the context. 情感目标

1. Get students to become interested in grammar learning. 2. Develop students’ sense of group cooperation.

教学过程

1.must & need & have to 情态动词 must 含义 表必要 “必须” 否定式 needn’t “不必” 注意点 ( 区别 have to) 有时表“偏要” 1

表推测 “一定” can’t “不可能” 只能用于肯定句，不能用于否定、疑问句

注 意：

1) must 表示推测时， 只能用于肯定句。

must do 对一般时的肯定推测 must be doing 对现在的动作进行肯定推测

must have done 对过去发生的事情作出的肯定判断 They have bought a new car. They must have a lot of money. He must be reading novels now

The road is wet. It must have rained last night. 2) need

作情态动词时,仅用于否定或疑问句,后接动词原形,表“需要” 作情态动词时,仅用于否定或疑问句,后接动词原形,表“需要” You needn’t return the book now.

Need he start from the beginning? --- Yes, he must. --- No, he needn’t/doesn’t have to.

2.needn’t have done 表示做了本不必要做的事情,意为“本不必要…”

Our color TV set is still good enough. You needn’t have bought a new one. 3.作实义动词时,表示“需要”，有人称、时态、和数的变化 He needs to finish it this evening. The classroom needs cleaning. 注意对need问句的回答:

--Need I finish the work today? --Yes, ________________. No, ________________. No, ________________. needn’t 对其它情态动词的回答:

--Shall I tell John about it? --No, you __________.

--No, you __________. 2. can/could 情态动词 can / could 含义 表能力 “能/会” 否定式 can’t “不会，不能” 注意点 区别 be able to 2

表许可 “可以” 表推测 “可能” can’t “不可以，不许” can’t “不可能” 代替may 主要用于否定/疑问句中

. can/could have done “本可以，本可能做某事” 用于肯定句中，表示对过去发生的事情做出的判断。

You could have had a better mark

5. can/could not have done 对过去发生行为进行推测:不可能做某事 刚才我还看见他了， 所以他不可能出国的。

I saw him just now so he couldn’t have gone abroad. 3.may/might 情态动词 含义 否定式 注 意 点 表许可 mustn’t 口语中也可用can’t may / “可以” “不许，严禁” might 表推测“可can’t 主要用于肯定句， 能” “不可能” 不能用在疑问句 （may not 可能不）

might/may have done,表示对过去发生的动作进行可能性推测， He may have gone to the clinic. 4.will/would 情态动词 用 法 will 表请求 表意志,意愿 表某种倾向或习惯 (第二人称) would 更客气的 过去的意志（愿） 过去的倾向或习惯 请求 5.shall ,should 和ought to

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情态动词 shall 用 法 征求对方意见 (第一, 三人称) 表示命令,警告, 威胁或允诺 (第二, 三人称) should / ought to 表示劝告,建议,命令或责表示推测, “理应, should 还可表示“竟任 估计, 大概, 可然” “应该, 必须” 望”

1.在陈述句中,shall用于二、三人称表示允诺、警告、命令、决心等。 You shall do as I say. (命令)

Nothing shall stop me doing it. (决心

Tell him that he shall have the book tomorrow. (允诺)

2.在疑问句中,用于一、三人称，用来表示请求或征求意见。 Shall I open the window for you？（征求意见）

3. should常表示劝告、建议、命令，与ought to意义相近，但ought to多表示责任、义务，语气强烈。

Young people should learn how to use computers

4.should/ought to have done表示责备或批评,意为“本应该…但”,ought to的语气更强烈,用于否定则表示“本不该…但”

You should/ought to have told her the truth earlier. 5.Should用于可能性推测时,表“应该，很可能” They left at 5:30. They should get there now. .可兼做行为动词的情态动词：need 、 dare 作为情态动词用，常用在否定句和疑问句中。 Dare (need) +S +V

S + daren’t (needn’t) +V

2.作实义动词用，常用在肯定句中, 有人称、时态、和数的变化

He needs to go there himself.

He has grown up,so we don’t need to worry about him. . 用情态动词完成句子

1).You’ve been working all day. You______ be very tired.

2).(The doorbell rings) I wonder who that is. It ______ be Lisa. She’s still in the library at this time.

3).It is a long time since we met last time. You ______ come and see us more often.

4.I haven’t decided where I’m going for my holidays. I _____ go to Australia.

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5.My father’s birthday is ccoming. What _____ I give him? 6.Why don’t you try on this dress? It _____ look nice on you.

7. “Who was the man talking with your teacher?” “I’m not sure. It ______ be her brother.”

8.I don’t know when the guests _____be here. They ______arrive at any time. .

3.完成下列句子：

I don’t know where she is, she _______________. (可能在武汉）(be)

2. At this moment, our teacher _______________ （想必在批改）our exam papers. ( mark / grade)

3. The road is wet. It ________________(一定下雨了） last night. (rain)

4. Your mother _____________________________

（一定一直在找你）(look). Philip ________________________ seriously in the car accident. (可能受了重伤). (hurt) 6. ---Linda has gone to work, but her bicycle is still here.

--She ___________________(可能走了)by bus.(go) 7. Mike ________________(一定还没有找回)his car, for he came to work by bus this morning.

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