完整word八年级条件状语从句讲练附答案

1、 引导条件状语从句的连接词主要有：if(如果）、unless（除非）或 as long as（只要）等。unless在意思上等于if.not。 一、条件状语从句用法 1、引导条件状语从句最常用的连词是if,由if引导的条件状语从句表示在某种条件下某事很可能发生。如: If you ask him, he will help you.如果你请他帮忙,他会帮你的。 If you fail in the exam, you will let him down.如果你考试不及格,你会让他失望的。 另外,if从句还表示不可实现的条件或根本不可能存在的条件,也就是一种虚拟的条件或假设,从句多用一般过去时或

2、过去完成时。 如: If I were you, I would invite him to the party.如果我是你,我会邀请他参加聚会。 2、unless = if.not. 除非,若不,除非在的时候 例如：Lets go out for a walk unless you are too tired. =If you are not too tired, lets go out for a walk. Unless it rains, the game will be played.除非下雨,比赛将照常进行。 3、so/as long as只要 例句;You may borrow

3、my book as long as you keep it clean. 只要你保持书的清 洁，你就可以把我的书借去。 So long as youre happy, it doesnt matter what you do. 只要你高兴，你做什么都没有关系。 二、时态问题 在条件状语从句中，要注意“主将从现”的规定，即主句用一般将来时，从句用一般现在时表示将来时。例句： I will come to see you if I have time. 我有时间，我就来看你。 常见考法 对于条件状语从句的考查，多以单选和完形填空的形式，从时态的角度设题，考查学生灵活运 用的能力，或从连词的意义角

4、度让大家选择连词。 典型例题：If he _in half an hour,we _wait for him. A. wont come ,wont B.wont come ,dont C.doesnt come ,wont D.will come ,dont 解析：本题考查条件状语从句“主将从现”的运用。题干的意思是“如果他一小时后不来，我们将不会等他了”，从“in half an hour”，“一小时后”可知本句说的是未来的事，那么if引导的条件状语从句要用一般现在时表示将来时，主句要用一般将来时。 答案：C 误区提醒 if 既可以引导条件状语从句，表示“如果”，也可以引导宾语从句，表达“

5、是否”。辨别它在这两种从句中的时态是我们经常容易出错的地方。另外，if 和unless的用法也需注意。 典型例题： -I wonder if your wife to the party. -If your wife _, so will mine。. A. will go， go B. will go, goes C.goes, will go D. will go, will go 解析：第一句中if表示“是否”，引导宾语从句，用将来时will go；第二句“如果你的妻子去，我的妻子也去”，if引导条件状语从句，用一般现在时表示将来时。 your wife，单三人称主语，所以用goes 。

6、 答案：B 一、If引导的条件句 *引导条件状语从句最常用的连词是if。 if 引导的条件句有真实条件句和非真实条件句两种（非真实条件句会在以后的虚拟语气中阐述），其引导的真实条件状语从句表示在某种条件下某事很可能发生。 1 1、“if从句（一般现在时）+主句（一般现在时）”的条件句-表达真理或事实（动作必然发生）。 If you heat ice, it turns into water.如果你加热冰，它就会变成水。 If you put suger into water, it disappears.如果你把糖放进水里，它就会溶解。 2、“if从句（一般现在时）+主句（一般将来时）”的条件

7、句-谈论可能发生的事情。 If it rains tomorrow, well stay at home.如果明天下雨，我们会呆在家里。 If I dont hear from him, I wont go. 如果没接到他的通知，我不会去。 【注】这类条件句主句部分还可以用情态动词，如 I may buy a car if I pass the driving test.如果通过驾驶考试，我可能会买一辆车。 If you go to another country, you must obey the local laws.如果你去另一个国家，就必须遵守当地的法律。 3、有时if引导的条件句可

8、以与“祈使句，and/or?”相互转换， If you dont hurry up, you will miss the bus. =Hurry up, or you will miss the bus.快点，否则你会错过这趟车。 If you use your head, youll find a way. =Use your head, and you will find a way.动动脑子的话，你就会想出办法。 二、unless引导的条件状语从句 unless意为“除非、如果不”，用来引导否定意义的条件句，等于“ifnot” Lets go out for a walk unless

9、you are too tired. = If you are not too tied, lets go out for a walk. 我们出去散步吧，除非是你太累。 Unless you brush your teeth every day, you will get a toothache. =You will get a toothache if you dont brush your teeth every day. 如果不每天刷牙，你就会牙疼。 用unless改写句子 1. If you havent listened carefully, you wont know how t

10、o do the exam questions. 2. If I dont leave now, I will be late. 3. We will get lost if we dont have a map. 4. If you dont return your book to the library today, you will be fined. 5. I will buy that dress if someone hasnt bought it already. 用if 或unless填空 1. _he wants to see me, you can tell him to

11、wait. 2. _it snows tomorrow, well have a day or two off. 3.We wont go to his party_he invites us. 4.She is sure to pass the exam_she is ill. 5. _Im tired, Ill have a rest for tea. 6.I wont buy that backpack_it costs less than 100 yuan. 7. I will lend you the money_you pay back on time. 8. You will f

12、ail the exam_you study hard. 9.I will buy a computer_I am able to save enough money. 10. _you drop a glass, it breaks. 单选 1. If I _ his phone number, I will tell you. A. find B. found C. will find D. have found 2. We will go camping if it _ tomorrow. A. Wont rain B. didnt rain C. doesnt rain D. isnt

13、 raining 3. Im waiting for my friend. If he _, I _ swimming alone. A. doesnt come; will go B. wont come; will go C.will come; wont go D. dont come; w2 ill go 4. _ you go to the supermarket at 7 p.m, you can buy a lot of cheap food. A. If B. Unless C. Whether D. When get to the party on time _ I catc

14、h the first train tomorrow morning. wont5. I A. If B. Unless C. Whether D. When 6. -Shall we go on a picnic this weekend? -Good idea! Unless it _. rain wontA. rains B. doesnt rain C. rain D. fit me well? - Of course. doesnt7. -Can I change the jacket for another one _ it A. unless B. if C. that D. t

15、hough 8. -if I get good grades this time, my parents _ me to Hong Kong for a five-day trip. A. take B. takes C. took D. will take ). 9.If everyone _ the traffic rules, the roads will be much safer (安全得多D. obeying C. obeies A. obey B. obeys 10.We mustnt cross the road if the light _ red. D. is C. tur

16、ns A. turning B. are I.单项选择 1.If you _ to the party, youll have a great time. A. will go B. went C. go D. going 2.It will be a long time _ peter _ his work. a. since, has finished b. after, finishes c. when, will finish d. before, finishes. 3. what will father _ us from Japan? a. take b. bring c. ca

17、rry d. make 5 I_ her the answer if she _me. a. can tell, will ask b. will tell, will ask c. would tell, ask d. will tell, asks 6. what are you going to do tomorrow? -well go to the library tomorrow if it _. a. isnt rain b. rain c. wont rain d. doesnt rain 7.Do you know when he will come back tomorro

18、w? -sorry, I dont know. when he _ back, Ill tell you. a. comes b. will come c. come d. may come 8. what will you do if you _ to the old folks home visit? a. go b. went c. going d. will go 9. If I eat _ food, Ill be very fat. a. too many b. many too c. too much d. much too 10.Ill give the book to him if he _ here next sunday. a. will come b. comes c. is coming d. came 11. There _an English film in our school tomorrow. a. is going to have b. will have c. is going to be d. has 12.