内容正文:
人教版八年级上册单元语法精讲课件
Unit10 If you go to the party, you will have a great time!
1
1
语法要点精讲
2
Grammar Focus
3
课后检测
4
即学即练
目 录
CONTENTS
2
01
语法要点
3
(一)情态动词can的用法
4
There will be fewer accidents if people obey the traffic rules.
“主将从现”
(1) if引导的条件状语从句,主句用一般将来时(will),从句用一般现在时。
(2) if引导的条件状语从句,主句谓语中也可以含有情态动词(must,can,could,
should等), 从句用一般现在时。
例句: 如果交通指示灯是红的,你必须停下来等一等。
If the traffic lights are red, you must stop and wait.
“主情从现”
e.g. If time is enough, walk there.
“主祈从现”
Let’s go shopping if it is sunny tomorrow.
(3) if引导的条件状语从句,主句可以时祈使句,从句仍用一般现在时表将来。
总结:
If 引导的条件状语从句时态:
1. 主将从现
2. 主情从现
3. 主祈从现
if的反义词:if...not...=unless,意思是:“如果不,除非”
I won’ t go there unless I hear from you. (同义句)
I won’ t go there _____ I _____hear from you.
if don’t
I won’ t go to the party if I am not invited. (同义句)
I won’ t go to the party ________ I am invited.
unless
变换:
1. 有if引导的条件状语从句的复合句中,当主句和从句的主语 均为you时,可转换为“祈使句,and+简单句”或
“祈使句,or+简单句”。
You can pass the exam