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1、Grammar Focus,情態(tài)動詞could,If we need help, what should we say politely?,Which is the most polite one?,1. Sweep the floor, Peter!,2. Can you sweep the floor, Peter?,3. Could you please sweep the floor，Peter?,Could you please clean your room? Yes, sure.Could you please do the dishes? Sorry, I cant. I ha

2、ve to do my homework.Could I go to the movies? Yes, you can.Could I use the car? No, you cant. I have to go out.,1. could表示請求，語氣委婉，顯得有禮貌 Could you please clean your room? 你可以打掃你的房間嗎？ 肯定回答：Yes, I can. Yes, sure. / Yes, of course. 是的，我可以。 否定回答： Sorry, I cant. I have to do my homework. 對不起，我不得不做作業(yè)。,2.

3、could表示請求許可，希望得到允許。 Could I go to the movies? 我能去看電影嗎？ 肯定回答：Yes, you can. Yes, sure. 當(dāng)然可以。 否定回答：No, you cant. 不，不行。,在表示請求幫助或請求允許的疑問句中，我們常用could代替can， 以表示禮貌、委婉或不確定的語氣，而can 則不具有這些語氣。這樣用時，不能把could 看作為can 的過去式形式。,3. could與can的區(qū)別 could與can都是情態(tài)動詞，could是can的過去式。二者都可用于表示請求，但是用法稍有不同。 can表示一般性的請求，語氣隨便，常用于熟人之間

4、或長輩對晚輩、上級對下級的場合； Can you tell us your story, Tony ? 你能給我們講講你的故事嗎，Tony？,could表示有禮貌的請求，語氣委婉，常用于非熟人之間或晚輩對長輩、下級對上級的場合。 Could you tell us if it snows in winter in Australia? 請告訴我們，澳大利亞冬天下雪嗎？Sure. 當(dāng)然可以。, Could you please do sth?,Could you please ?,sweep the floor,fold your clothes,cook the meal,clean the

5、window,小試牛刀( )1. Excuse me, could you help me with the heavy box? _. A. Yes, I do B. It doesnt matter C. Of course,小試牛刀( )2. Could I have your name, please? _. A. Sorry, Im not B. Yes, you could C. You can call me Jenny,小試牛刀( ) 3. Could you please _ me look for my dog? A. help B. helped C. to help(

6、)4. Could I use your bike? Sure, you _. A. might B. can C. should,Could的用法,1.I could run fast when I was a child.,2.Could you help me?,3.You could talk to your teacher now.,4.He couldnt be at the school then.,can 的過去式,禮貌的請求,提出建議,推測,HomeworkCould you please write down 5 sentences how to ask or suggest?,