Unit 10 If you go to the party, you'll have a great time!语法-if条件状语从句（含答案）

Unit10 if条件状语从句
一、定义
条件状语从句
★是由if等引导词所引导的状语从句
★“条件”是指某一件事情实现之后（从句中的动作），其它事情（主句中的动作）才能发生
★条件状语从句中，引导词所在的句子是从句，另一部分为主句。
★if从句既可放在主句前，也可放在主句后。
若if从句放在主句前，须用逗号隔开。
例：
If my mother is free, she will take me to the park.
= My mother will take me to the park if she is free.
如果我妈妈有空，她将会带我去公园。
二、用法
在if引导的条件状语从句中，符合以下原则：
★原则1：主将从现
主句是一般将来时，从句用一般现在时。
例：
If my brother comes back, he will take me to the park.
★原则2：主情从现
主句含有情态动词can/may/might/must/should等，从句用一般现在时。
例：
If you want to be healthy, you should keep a good diet.
★原则3：主祈从现
主句是祈使句，从句用一般现在时。
例：
Don’t play with the knife if you don’t want to get hurt.
三、与其他句式之间的转换
(1) 借助“祈使句+and / or+ 一般将来时的句子”这一句型来转换。and在句意上表示顺承关系, or表示转折关系。如:If you get up early, you'll get there on time. = Get up early, and you'll get there on time. = Get up early, or you won't get there on time. 早点起床, 你就会准时到那里。
(2) 借助介词without或with来转换条件状语从句。如:If there is no water, fish will die. = Fish will die without water.如果没有水, 鱼就会死。If you help me, I'll finish the work soon. = With your help, I'll finish the work soon. 如果你帮助我, 我就会快点完成工作。
(3) if … not 导的条件状语从句, 可以借助连词unless来改写。如You will be late if you don't go there by bus. = You will be late unless you go there by bus. 如果你不乘公共汽车你就会迟到。
四、语法精炼
I. 用括号内所给单词的适当形式填空。
1. If it rains tomorrow, I _______ (stay) at home.
2. He will take a trip to Beijing if he ________ (be not) busy next week.
3. Please tell Li Jun about it if he _______ (come) back
4. If you don't wear your school uniform to the party ，the teachers __________ (not let) you in.
5. She __________ (not go) shopping with her parents if it snows this afternoon.
II. 单项选择。
( ) 6. ----Do you know when he will come back tomorrow
----Sorry, I don't know. When he ______ back, I'll tell you.
A. comes B. will come C. come D. may come
( ) 7. Mary will go to Sanya if she ______ a five-day-trip.
A. have B. had C. will have D. has
( ) 8. What will you do if you ______ to the party without invitation
A. go B. went C. going D. will go
( ) 9. If I eat too much food, I _____ too fat.
A. am B. was C. will D. will be
( ) 10. I'll give the book to him if he ______ here next Sunday.
A. will come B. comes C. is coming D. came
III.同义句转换, 每空一词
11. Study hard, or you won’t pass the exam. If you study hard, you ______ ______ the exam.
12. Take a taxi, and you'll catch the train.______ you ______ a taxi, you’ll catch the train.
13. If you don't help me, I can't catch up with the others. I can't catch up with the others ______ ______ ______.
14. We will be late for the meeting if we aren't quick. We will be late for the meeting ______ ______ ______ ______.
15. If you are late, the teacher will be angry.______ ______ late, ______ the teacher will be angry.
Ⅳ.翻译下列句子。(每空填一词)
16.如果他有空，他会帮你的。
If he _____ ______, he_____ ______ you.
17.如果他看电视太久了，他的父母会不高兴的。
If he______ ______ too much, his parents____ _____ unhappy
18.如果我们为他举行一场生日聚会，大家都会来的。
Everyone____ ______ if we______ a birthday party for him.
19.如果明天不下雨，我会和你一起去公园的。
If it____ ____tomorrow, I_____ ______ to the park with you.
20.如果他迟到了，老师会说些什么呢
What_____ the teacher say if he_____ late
参考答案：I. 1. will stay 2. isn’t 3. comes 4. won’t let 5. won’t go
II. 6-10 ADADB
III. 11. will pass 12. If; take 13. without your help 14. unless we are quick 15. Don’t be; or
Ⅳ. 16.is free , will help 17.watches TV , will be 18.will come , have
19.doesn't rain , will go 20.will , is