Unit 10 If you go to the party, you’ll have a great time
单元语法小专题（Grammar Focus）
语法精讲
if引导的条件状语从句的用法
条件状语从句通常由连词if引导，意为“如果、假如”，表示在某种条件下，很可能会发生某种事情。
1.if条件状语从句的位置
在 if 引导的条件状语从句中，if 条件句位置灵活，可直接放在主句后面，若 if 条件句放句首， 从句后面要加逗号，和主句隔开。如：
If I have time tomorrow, I’ll
go to the countryside with my friends.= I’ll go to the countryside with my friends if I have time.如果我明天有时间，我将和我的朋友
们去乡下。
2.if条件状语从句的时态搭配
if 引导条件状语从句，主句用一般将来时，从句则用一般现在时。如：
If it rains tomorrow, I won’t climb the hills.如果明天下雨，我就不爬山。
温馨提示：在if 引导的条件状语从句中，有时根据句意的需要主句可能用到情态动词。如：
If you finish your homework, you can watch TV.如果你完成了家庭作业，你可以看电视。
3.if引导的条件状语从句与if引导的宾语从句的区别
if 引导的条件状语从句，if意为“如果”，主句用一般将来时，从句则用一般现在时；if引导宾语从句时，if意为“是否”， 相当于 whether，时态需根据语境确定。如：
I don’t know if it will rain tomorrow.我不知道明天是否会下雨。
if条件状语从句用法歌诀：
if 条件句不一般,几个要点记心间;
条件句,放在前,逗号要放句中间。
条件句，表可能，主句多用将来时；
条件句，表事实，主句常用现在时。
4.与其他句式之间的句型转换
(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 ear
ly,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, fis
h will die.=Fish will die without
water.如果没有水，鱼就会死。
If you help me, I’ll finish the wo
rk 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。
语法精练
Ⅰ.用括号内所给单词的适当形式填空。
1.I_______ (buy) you a computer if you get good grades.
2.We_______ (no
t go) there if he doesn’t agree.
3.You will win the match if you ________(practice) hard.
4.Please call me if you______ (have) any questions.
5.You may go swimming if you_____
_ (finish) your homework.
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.ha
ve 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.改为同义句，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.Use your head and you’ll have a good idea.
_____ you _____ your head,______ have a good idea.
15.If you are late,the teacher will be angry.
______ ______ late, ______ the teacher will be angry.
单元语法小专题（Grammar Focus）
Ⅰ.1.will buy2.won’t go3.practice4.have5.finish
Ⅱ.
6-10ADADB
Ⅲ.11.will pass 12.If;take 13.without your help 14.If;use;you’ll 15.Don
’t be; or