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1、Unit 4 语法篇_学生通过本讲学习，能够掌握本单元的重点语法，并在综合能力上有一定的拓展。1. Why dont you do sth?=why not do sth 为什么不做?2. 在带有till或until引导的时间状语从句的主从复合句里，如果主句用肯定式，其含义是“一直到时”谓语动词只能用延续性动词。如果主句用否定式，其含义是“直到才”, “在以前不”, 谓语动词可用瞬间动词。例如：The young man read till the light went out（熄灭）.Lets wait until the rain stops. We wont start until Bo
2、b comes. Dont get off（从下来） until the bus stops.【Till是指直到某一特定事件发生的时候，而在那个时刻之后，该事情或状况仍将持续。 Until是指直到某一特定事件发生的时候，而讲话的人在自己心里认为，在那个时刻之后，该事情或该状况将中止（不怎么可能持续）。固定组合里from morning till night，till/until是不能替换的，】3. so that (1)目的状语从句通常由 so that, in order that（为了，以便）引导。例如：We started early so that we could catch the
3、 first train.He studies hard so that he could work better in the future.We used the computer in order that we might save time.(2) so that既可引导目的状语从句，又可引导结果状语从句。区别这两种从句的办法有两个：1)目的状语从句里往往带有情态动词can, could, may, might等。2)从意思上看，目的状语从句往往表示的目的很明确。例如：Speak clearly so that they may understand you. (目的状语从句)Jac
4、k is badly ill so that he has to rest. (结果状语从句)4. Although(1)让步状语从句通常由although, though等连词引导。例如：Though he is young, he knows a lot.Although I am tired, I must go on working.(2) although(though)不能用在同一个句子中。例如：我们不能说：Though it was raining hard, but he still went out.应该说：Though it was raining hard, he sti
5、ll went out.或It was raining hard, but he still went out.1. I will wait I hear from you. A. untilB. sinceC. whileD. because2. the work is difficult, all the workers are keeping on working. A. ButB. AlthoughC. AndD. So3. We turned on the light we could see what had made a big noise. A. howB. so thatC.
6、 in order toD. although4. Would you mind him here? A. sitB. sittingC. to sitD. sits5. Music isnt Sallys main interest, she doesnt want to go to the concert today. A. butB. soC. orD. and基础演练一、单项选择1. - This book is a bit difficult. read something easier?- All right. A. Why not toB. Why dontC. Why notD
7、. Why not you2. - Why dont you music club?- Im sorry. I cant sing or dance. A. to joinB. joinC. joiningD. to join in3. hes tired, he keeps working. A. Although; butB. Although; /C. /; althoughD. But; /4. Mike feels happy every day he is poor. A. ifB. soC. becauseD. although5. Tom didnt have dinner h
8、is mother came back from work. A. whileB. unlessC. untilD. since6. You must work harder and harder you can go to a better college. A. in order toB. so as toC. thatD. so that7. Lily knows some Chinese, she can read the words on the bottle. A. soB. orC. butD. for8. We need one person to take part in t
9、he game, you him. A. both; andB. neither; nor C. either; orD. not only; but also9. We didnt know each other at that time, were good friends now. A. becauseB. sinceC. butD. if10. I will stay with you the doctor comes to help you. A. afterB. ifC. unlessD. until二、翻译(根据中文提示完成句子) 11. 我真的很累因为昨晚我学习到深夜。Im r
10、eally tired because I studied last night.12. 在车停稳前别下车。Dont the bus it .13. 为了从网上下载信息，他买了一台电脑。He bought a computer he could download information on the Internet.14. 尽管离家很远,他爸爸还是经常走着去上班。 its very far form his home, his father goes to work .15. 今天晚上你为什么不早一点儿睡觉呢？ go to sleep earlier this evening?巩固提高一、适
11、当形式填空(单句适当形式) 1. - Would you like (anything) to drink?- Yes, please. 2. - What about (go) bike riding?- Im afraid not. My bike is broken. 3. Youd better (make) a decision earlier. 4. Why dont you (swim) with us? 5. Lets (help) him push the cart.二、单项选择 6. You have to leave now you can catch the early
12、 bus. A. so thatB. as soon asC. becauseD. if 7. Jack still came to school he was ill. A. thoughB. butC. ifD. so 8. - Why not come and join us in the game?- . But I must meet Mr. Wu at his office now. A. Id like toB. Lets go C. Yes, pleaseD. Its a pleasure 9. - How about going to the Disneyland together?-
