Unit 3 Could you please clean your room?语法讲练专题-情态动词could的用法（含答案）

Unit 3 Could you please clean your room
单元语法讲练专题
情态动词could的用法
1.作为can的过去式时，情态动词could表示过去的能力和可能性，其否定形式是could not，可缩写为 couldn’t。
He could write poems when he was 10. 他十岁时就会写诗了。
Judy couldn't have enough money for a car. 朱迪不可能有足够的钱买汽车。
2.情态动词 could可用于表示建议做某事，意为“可以”，此时不表示过去，只是比can的语气更委婉。
You could ask your doctor for a check-up. 你可以请医生做个体检。
3.情态动词could可用于礼貌地提出要求或征询许可，此时并非can的过去式，而表示语气的委婉。
用法和句式 示例
提出请求： Could you please(not) do... Could you please take the dog for a walk 请你去遛遛狗好吗？
征询许可： Could I/we do... Could I go out for dinner with my friends 我能和朋友一起出去吃（晚）饭吗？
肯定回答常用语： Of course./Certainly./ OK./Sure./No problem.等 -Could you please clean the room 请你打扫一下房间好吗？ -Sure.-当然可以。
-Could you open the windows -你能打开窗户吗？ -Sorry, but I have got a cold. -抱歉，我感冒了。
否定回答常用语： Sorry./Certainly not./ No, you can’t.等
（1）对提出请求或征询许可的句型做否定回答时，通常以sorry或I＇m sorry开头。
-Could you help me with my English now 一你现在能帮我学英语吗？
-I'm sorry, but I have a football match ten minutes later. -抱歉，我十分钟后要参加一场足球赛。
（2）如果问句中使用 could，回答时要用can或can’t，不能用could或 couldn’t。
-Could I use your bike -我能用一下你的自行车吗？
-Sure, you can. 当然可以。
（3）其他常见的表示委婉请求或征询许可的句型：
①“Will／Would you please （not） do...？”表示“请你（不）······好吗？”
②“Would you mind （not） doing...？”表示“你介意（不）······吗？”
③“May I do...？”表示“我可以.
语法精练
一.单项选择。
1._________ you tell me whether it often snows in your hometown in winter
A. Could B. Might C. Should D. Need
2.-Could you please help me clean up the classroom after school
-_________ .
A. Yes, quite well B. Take it easy C. That's all right D. Sure, with pleasure
3.By the time she was eight, Linda_________ read English and French.
A. could B. must C. need D. may
4.-Could I go to the shop
-Yes, _________
A. you can B. you could C. you do D. you are
5.Could you please_________ us Mary's telephone number
A. to give B. give C. giving D. to giving
6-Some people don’t show their talents at the very beginning.
-I agree. Even Einstein_________ read until he was seven.
A. can't B. mustn't C. couldn't D. needn't
7. David, _________ you please sweep the floor and take out the trash
A. could B. may C. might D. must
8-Could you please help me wash the car, Tony
_________ I'm studying for my coming English test now.
A. That's right B. I'm sorry C. It doesn't matter D. Not a tall
9.-Could you please help me do the dishes .I have to do my homework, Mom.
A. My pleasure B. It doesn't matter C. It's a shame D. I'm afraid not
10.-Mum, it’s too hot. I swim in the lake
-No, you _________ ,That's too dangerous!
A. Should; can't B. Need; mustn't C. Must; needn't D. Could; mustn't
11,-Could I use your bike
-Yes, you_________ But you_________ keep it clean.
A. could; can B. can; must C. must; can D. could; must
12.Could you please speak a little louder I _________ hear you very well.
A. can't B. mustn't C. shouldn't D. needn't
13.-Jerry,would you like to tell me how to take a taxi through “Didi”
- _________ .
A. Take it easy B. You are welcome C. Thank you D. Sure, I'd love to
答案:
1.A 2.D 3.A 4.A 5.B 6.C 7.A 8.B 9.D 10.D 11.B 12.A 13.D
二·可型转换。
1.Could you please wash clothes at this time？（改为否定句）
Could you please_________ _________ clothes at this time
2．-Could you please answer these questions？（作肯定回答）
-_________ _________ .
3.-Could I húng out with 'my friends after the party？（作否定回答）
-No, _________ _________
4. “Can I play for a while after school ” she asked. （改为间接引语）
She asked_________ _________ _________ play for a while after school.
5.Would you mind passing me the doll？（改为同 义句）
_________ you please_________ me the doll
答案:
1.not wash 2.no problem 3.you can’t 4.if she could 5.Could; pass
三.根据汉语意思完成句子，每空一词。
1.能请你帮我扫地吗？
_________ _________ _________ _________ me sweep the floor
2.-爸爸，我今晚可以玩电脑游戏吗？
-是的，你可以。但你必须先完成你的家庭作业。
-_________ I_________ computer games tonight, Dad
-Yes, you_________ .But you have to finish your homework first.
3.-能请你帮我把门打开吗？
-好的，当然可以。
_________ you_________ _________ me open the door
-Yes, _________ .
4.-明天上午我们可以去爬山吗？
-对不起，你们不能。
-_________ we_________ to climb the mountain tomorrow morning
-Sorry, you_________ .
答案:
1.Could you please help
2.Could; play; can
3. Could; please help; sure
4.Could; go; can’t