内容正文:
班级 姓名 学号 分数
Unit 6 TV programmes
If,unless引导的条件状语从句
(时间:60分钟,满分:100分)
定义:
★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。
(2)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.
(3)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。
1、 单项选择(本大题共50小题,每小题2分,共100分)
1.I don’t know if it ________ tomorrow. If it ________, I’ll go for a picnic.
A.rains;doesn’t rain B.will rain;doesn’t rain
C.rains;won’t rain D.will rain;won’t rain
2.— Lin Fei looks worried. What’s the matter?
— His parents always talk about what will happen if he ________succeed.
A.didn’t B.don’t C.doesn’t D.won’t
3.You will never succeed ________ you don’t put your heart into your work.
A.unless B.until C.after D.if
4.—Thank you for telling me so much about nature.
—Don’t mention it. If you have questions, ________ to me any time.
A.comes B.to come C.come D.coming
5.If you ever go to London, ________ you visit the Science Museum.
A.making sure B.make sure C.to make