Unit3 语法 can 与could的用法 2022-2023学年人教版英语八年级下册

can 与could(可以 能 可能) 1. 表能力 can（现在）现在能力 could（过去）过去的能力 I can speak a little English. I can play the piano. I could play basketball well when I was a kid. He could swim at the age of five. 2. 表可能性 can(现在) 否定疑问居多 could（现在-可能性极小/过去） This book could be Lily's That man can’t be my English teacher. He has gone to America. 3. 表允许 许可 can(不正式) could(礼貌) Could I please go out?请问我可以出去吗？ Could I do the dishes?我可以洗餐具吗？ Could I use your book? 4. 表请求 can(不正式) could(礼貌) Could you please take out the rubbish? 请你把垃圾倒掉好吗？ Could you turn on the TV for me? 你能帮我打开电视吗？ 答语中注意的问题 肯定回答： Certainly./Sure./Of course./ Yes，I agree.That’s OK./All right.等。 否定回答，通常以sorry开头。 I’m sorry I can’t./I’m afraid not./ I’m really sorry，but… 注意：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 pen?我可以用一下你的钢笔吗？ —Sure，you can. ——当然可以。 固定结构 Can’t…too/enough 再…也不为过 We can’t be too careful to cross the road. (过马路时，我们无论怎么小心也不为过) can’t help doing sth 情不自禁做某事 can’t help to do sth 不能帮忙做某事 can’t help but do sth 不得不做某事 can but do sth 只好做某事 We can but wait until Mary comes. 即学即练 ( )1. —Could you please _____________me your notebook, Grace? —Certainly. Here you are. A. borrow B. to borrow C. lend D. to lend ( )2.Susan borrowed a car ________her friend. A.to B.from C.with D.by （ ）3.— Hi,Jack! Could you come to our English party? — Sorry, I _______. I have to look after my little sister at home. A. must B. could C. can't ( ) 4.Could you ________watch TV? I'm sleeping. A.don't please B.not please C.please not ( )5. — Could you please turn off the light? —______. A. Yes, I could B. It doesn’t matter C. Yes, sure 学科网（北京）股份有限公司 $