Unit9 Can you come to my party? 词汇讲练一、can 和 have to的用法1. can可以表示, 意思是“能, 会”, 在过去式中用could 。2. can还可以表示请求可, 在这一用法中, can和could都可用现在, 但could比can语气更加委婉。can (could)用在一般疑问句中表示请求可时, 其肯定回答一般为 “Sure, I’d love to.”或“Yes, please.”；否定回答通为“Sorry, I can’t.”。3. can还可以表示可能性, 用否定句中。4. have to意为“必须, 不得不”, 与must意义相似, 但must强调人的主观意识, 而have to强调客观的必要。have to变否定时要借助助动词do, 表示“不必”。5. can和have to后面都接动词原形。can没有人称和数的变化, 而have to有。用can或have to的适当形式填空。1. ________ (can) you swim when you were 8 years old?2. —___________(can) I use your bike? —Sure! 3. Mr Smith _________(can not) be at school. He left for Shanghai this morning.4. Tom ____________(have to) leave because he doesn’t have his ID card with him.5. You ____________(not have to) do your homework now. 6. Bob can’t come out to play because he _____ help Dad in the garden. A. can B. must C. has to D. have to7. (2008·厦门) --- I can’t give up smoking, doctor. --- For your health, I’m afraid you ________. A. may B. can C. have to D. must8. 【2010 达州】--- Must I finish my homework right now? --- No, you ____. |
