2018中考英语语法专题条件状语从句讲解+练习(无答案)

1、常用弓丨导词： if, uni ess, as/so long as1、if 从句+祈使句，“如果，就If you do not feel well, please go to see the doctor.If you want to know more about it, call now.Make sure you visit the Scie nee Museum if you ever要去参观科学博物馆。2、主将从现If I start after dinner, I ll finish it before I go to bed.如果我晚饭后开始，睡觉前我就能完成。主句也可用“情态

2、动词+动词原形”She may come with us if she arrives in time.如果她来得及时，就可以和我们一起去。3、if 条件状语从句和并列句的转换Hurry up, or you ll be late. = If you don t hurry up, you ll be late.Study hard and you will pass the exam. = If you study hard, you will pass the exam.练习（一）句型转换1. Run fast, or you ll be late for school._ you_ fa

3、st, you ll be late for school.2. You can buy the dict ionary if you take eno ugh money with you.Take eno ugh money with you,_ buy the dictio nary.3. If there is no air, none of us can live.None of us can live_ .4、unless “除非”Don t leave the buildi ng un lessI tell you to.不要离开大楼，除非我准许。Un less you have

4、 fini shed your homework, I won t allow you to watch TV.除非你已完成了作业，否则我是不会让你看电视的。unl ess = if notYou ll be late if you donthurry. = Youll be late条件状语从句如果你感觉不舒服，就去看医生吧。如果你想了解更多内容，现在就打电话吧。go to London.如果你去伦敦，一定unles s you hurry.2I get up early.练习(一) if not 与 uni ess 相互替换1. He will not go uni ess I come

5、with her.2.If you don t finish it,I will be an gry.3.Uni ess I am mistake n, 1ve seen that man before.4.You won t get a good job,uni ess you work hard.5.Un less the strike has bee n called off, there will be no trai ns tomorrow.5、 as/so long as只要You may use my dictionary as/ so long as you don t kee

6、p it too long.只要使用时间不太长，你可以用我的词典。You can take my car as/so long as you drive carefully.你可以用我的汽车，只要你小心点儿开。练习(一)用 if 或 unless 填空1. _ he wants to see me, you can tell him to wait.2. _ it snows tomorrow, we ll have a day or two off.3. We won t go to his party_he invites us.4. She is sure to pass the exa

7、m in ati on_ she is ill.5. I ll take that computer_I have eno ugh mon ey.6. _my gran dma wears glasses, she can see better.7. I won t buy that backpack _it costs less than $208. _ I m tired; I ll have a rest for tea.9. You won t get paid for time off_ you have a doctor s note.10. You will get a toot

8、hache_ you do clea n your teeth regularly.(二)用所给单词的适当形式填空1. If he_(get) a low mark in the test, he_ (study) harder.2. If you_(swim) every day this summer, you_ (be) very healthy.3. If he_(not hurry), he_ (not see) the beg inning of the match.I can t catch the trainif I dontget up early. = I cant cat

9、ch the trainunless34. You can t go out uni ess you _(fini sh) your homework.5. Uni ess I save my money carefully, I_(not be) able to buy a football.46. If it_(not rain) tomorrow, we_(go) to the park.7. If he_(retur n) to the school, I_(let) you know.8. He_smoke uni ess he_(have) eno ugh money.9. The

10、y can remember it better if some one_(give) them some advice about it.10. The man_ (set off) if he_(buy) the air ticket.(三)单项填空his phone nu mber, I will tell you.you go to the supermarket at 7 p.m., you can buy a lot of cheap food.won10. Each stude nt can ask teachers for help if he_ how to work out

11、 the problem.A will kn owB won t knowC don t knowD doesn t know1. If IA. findB. foundC. will findD. have found2. We will go camp ing if ittomorrow.isn A. Won t rainB. didn t rainC. doesn t rainD.t raining3. I m waiting for my friend. If heswimmi ng alone.A. doesn t come; will goB.won tC. will come;

12、won t goD. don t come;4.A. IfB. UnlessC. WhetherD.When5. I won t get to the party on timeI catch the first train tomorrow morning.6.rain7.8.9.A. IfB. UnlessShall we go on a picnic this weeke nd?A. rainsB. doesn t rainCan I change the jacket for another oneA. uni essB. ifC. WhetherGood idea! Uni ess itC. rainitdoesn t fit mewell?C. thatD