Could I go out for dinner with my friends?Sure, that should be OK.Could we get something to drink after the movie?No, you cant. You have a basketball game tomorrow.Could you please take the dog for a walk?OK, but I want to watch one show first.Could you please take out the rubbish?Yes, sure.阅读下列句子，观察问句的用法及回答。阅读下列句子，观察问句的用法及回答。Key sentence structures Could you（please）+ V-原形原形？表示委婉地提出请求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. Peter, could you please take out the trash? Sure, Mom. 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在表示请求帮助或请求允许的疑问句中，常用句中，常用could代替代替can，以表示礼貌，以表示礼貌，委婉或不确定的语气，而委婉或不确定的语气，而can则不具备这则不具备这些语气。这种情况下不能把些语气。这种情况下不能把could看作看作can的过去式。以上两句中用的过去式。以上两句中用could是为了表是为了表示礼貌的请求。表示请求帮助或请求允示礼貌的请求。表示请求帮助或请求允许时，除了许时，除了can, could之外，还可以用之外，还可以用may，句子的表达方式也各有不同，可以，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：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? 对于对于、句所作允答可以各种各样，如同意句所作允答可以各种各样，如同意可以说可以说Yes或或Sure或或Certainly，还可说，还可说Yes, (do) please. 或或Of course. (you may/can). 或或Go ahead, please. 或或Thats OK/all right; 如果不同如果不同意，可以说意，可以说Im sorry you cant. 或或Im really sorry, but I have to use it today. 要避免说要避免说No, you cant. 这样显得很不礼貌。否定回答通常这样显得很不礼貌。否定回答通常用委婉语气。用委婉语气。 Do you mind if I use your car for a day? 对于句对于句所作回答可以说所作回答可以说Never mind. /Not at all. 表表“不介意不介意”。不能用。不能用Yes. /Sure. /Of course. /Certainly.等。无论肯定还是否定应答等。无论肯定还是否定应答中，要避免使用中，要避免使用could，要用，要用can或或may。因为。因为应答须用确定的语气。而应答须用确定的语气。而could在表请求的问在表请求的问句中是为了表示礼貌或委婉语气，用在应答句中是为了表示礼貌或委婉语气，用在应答中则成了不确定语气，与情理不符。所以应中则成了不确定语气，与情理不符。所以应答中不说答中不说Yes, you could. 或或No, you couldnt. 而要说而要说Yes, you can. 或或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？表示一种有礼貌的请求或提议，其后连接原形动词，貌的请求或提议，其后连接原形动词，比比Can you /I？语气更委婉。类似？语气更委婉。类似句型有：句型有：Would you like + sth. / to do sth.? May I + do sth.? Shall we + do sth.? Would you mind + sth. /doing sth.? What / How about + sth. /doing sth.? 肯定回答有肯定回答有Sure. /Of course. / Certainly. /OK. /Great. / Well. / Good idea. / I agree. 等。否定回答有等。否定回答有Sorry / No, you cant. 等。等。 Make up dialogues using the sentences in Grammar Focus with your partner.A: Could you please take the dog for a walk?B: OK, but I want to watch one show first.If we are having a camping trip, what should we do before the trip?What should we do before the trip?buy some drinksbuy some drinksbuy some foodbuy some foodtake a big clothtake a big cloth bring a tentbring a tenttake an umbrellatake an umbrellatake a rubbish bagtake a rubbish bag bring a camerabring a cameraprepare some programsprepare some programsTo-do listNamebring a tentLiu Chang4c Make a list of things your group needs to do for a camping trip. Then discuss who will do them and complete the chart. A: Could you please bring a tent, Liu Chang?B: Sure. And could you please?C: Sorry, I cant. I have to Write a letter to your friend to ask him/her to take care of your house when you are on vocation.