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1、Unit 3知识目标：情态动词could的用法以及运用could表示有礼貌的请求学习过程一.自主学习由小组长带领组员复习以下短语，写出每个短语的中文意思。fold ones clothesdo the dishesuse ones computertake out the rubbishmake the bedsweep the floorstay out latebe angry with sb.take sb. for a walkclean the living roomwork oncome overdo the houseworkget a ride导入新课Step 1学生以小组为单
2、位，阅读下列句子，观察问句的用法及回答。Could I go out for dinner with myfriends?Sure, that should be OK.Could we get something to drink after themovie?No, you cant. You have abasketball game tomorrow.Could you please take the dog for a walk?OK, but I want to watch one showfirst.Could you please take out the rubbish?Ye
3、s, sure.Step 2精要引导GrammarCould you（please）+ V-原形？表示委婉地提出请求1. Could you please clean your room?Yes,sure. / Of course./ Certainly./All right.2. Could you please do the dishes?Sorry, I cant. I have to do my homework.在表示请求帮助或请求允许的疑问句中，常用could代替can，以表示礼貌，委婉或不确定的语气，而can则不具备这些语气。这种情况下不能把could看作can的过去式。以上两句
4、中用could是为了表示礼貌的请求。表示请求帮助或请求允许时，除了can, could之外，还可以用may，句子的表达方式也各有不同，可以用不同的方式来表示同一个概念。例：Could/Can/May I use your car for a day?I wonder if I could use your car for a day?对于、句所作允答可以各种各样，如同意可以说Yes或Sure或Certainly，还可说Yes, (do) please.或Of course. (you may/can).或Go ahead, please.或Thats OK/all right;如果不同意，可以
5、说Im sorry you cant.或Im really sorry, but I have to use it today.要避免说No, you cant.这样显得很不礼貌。否定回答通常用委婉语气。Do you mind if I use your car for a day?对于句所作回答可以说Never mind. /Not at all.表“不介意”。不能用Yes. /Sure. /Of course. /Certainly.等。无论肯定还是否定应答中，要避免使用could，要用can或may。因为应答须用确定的语气。而could在表请求的问句中是为了表示礼貌或委婉语气，用在应答中
6、则成了不确定语气，与情理不符。所以应答中不说Yes, you could.或No, you couldnt.而要说Yes, you can.或Sorry. /No, you cant.Could I please use your computer?Sorry, Im going to work on it now.Well, could I watch TV?Yes, you can.Could I/you please ？表示一种有礼貌的请求或提议，其后连接原形动词，比Can you /I？语气更委婉。类似句型有：Would you like + sth. / to do sth.?May
7、 I + do sth.?Shall we + do sth.?Would you mind + sth. /doing sth.?What / How about + sth. /doing sth.?肯定回答有Sure. /Of course. / Certainly. /OK. /Great. / Well. / Good idea. / I agree.等。否定回答有Sorry / No, you cant.等。强化练习：Make up dialogues using the sentences in Grammar Focus with your partner.A: Could y
8、ou please take the dog for a walk?B:OK,but I want to watch one show first.4a Write R for requests and P for permission. Then match each one with the correct response.1. _ Could Ihang out withmy friends after the movies?出去玩2. _ Could you please pass me the salt?3. _ Could I borrow that book?4. _ Coul
9、d you help me do the dishes?5. _ Could you lend me some money?a. Yes, here you are.b. Hmm. How much do you need?c. Yes, sure. No problem. I finished reading it last night.d. Yes, but dont come back too late.e. No, I cant. I cut my finger and Im trying not to get it wet.Note：borrow和lendborrow和lend都有“
10、借”的意思，但它们的含义和用法有所不同。borrow表示“借入”，即把本来不属于自己的东西借来暂时使用，常与介词from连用。如：You can borrow a book from the library.lend表示“借出”，即把属于自己的东西借给别人暂时使用，常与介词to连用，也可以跟双宾语。如：Hes going to lend his bike to Tom.You mustnt lend others my pen.4b Fill in the blanks in the conversation.A: I hate to _ chores.B: Well, I hate some
11、 chores too, but I like other chores.A: Really? Great! _ I ask you to _ me with some chores then?B: What do you need help with?A: _ you please _ my clothes for me?B: I dont want to do that! Its boring!A: OK. Then _ you _ do the dishes for me?B: Sure, no problem. But _ we go to the movies after that?A: Sure. Ill finish my homework while you help me with the dishes. Then we can go to the movies.总结反思：