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英语计划总结之if引导的条件状语从句
if引导的条件状语从句是中考中常考的知识点,我们一起来学习一下它的具体用法吧!
一、连接词if
if是引导条件状语从句的连接词,表示主句中动作发生的条件。还是看看具体例子吧!
If you get up early, you will catch the bus.
如果你早起的话,就能赶上那班公共汽车。
You must see the doctor if you are ill.
如果你生病了,就必须去看医生。
二、if引导的条件状语从句的构成
构成方式为 :“主句+if引导的条件状语从句”或“if引导的条件状语从句+主句”。在含有条件状语从句的复合句中,如主句在前,从句在后,主从句之间不用标点;如要强调从句的内容,则把从句放在主句的前面,这时主从句之间要用逗号隔开。例如:
I will go to his birthday party if he invites me.
=If he invites me, I will go to his birthday party.
三、if引导的条件状语从句的时态
在一般情况下,如果主句谓语动词表示将来的意义,从句谓语动词用一般现在时表将来。常见的有以下几种:
1. 主句是一般将来时。例如:
You will be late for school if you get up late.
如果你起晚了,上学将会迟到。
If it rains tomorrow, we won't go to the Great Wall.
如果明天下雨,我们就不去长城。
2. 主句的谓语动词是want, hope, wish等词。例如:
I hope to visit her if I'm free.
如果我有空,我希望去拜访她。
3. 主句的谓语动词含can, may, must等情态动词。例如:
If I finish my homework, I can watch TV.
如果我完成了家庭作业,就可以看电视。
4. 主句是祈使句。例如:
Don't forget to lock the door if you are the last one to leave.
如果你最后一个离开,别忘了锁门。
【跟踪训练】
一、用所给动词的适当形式填空。
1. If I run every day, I (be) healthier.
2. If you (not eat) healthily, your body won't be
well.
3. If you sleep well, you (feel) better.
4. If you (relax), you'll sleep better.
二、选择填空。
1. We won't wait for you _________ you can't come here on time.
A. if B. unlessC. whenD. until
2. If he _________ harder, he will catch up with us soon.
A. study B. studies
C. will studyD. studied
3. Please buy some stamps for me if you_________ the post office.
A. passB. will pass
C. passed D. passes
4. Daniel _________ to see his grandma if he_________ free tomorrow.
A. will come, will be
B. comes, is
C. will come, is
D. comes, will be
5. I'm waiting for my friend. _________, I will go swimming alone.
A. If he is coming
B. If he won't come
C. If he will come
D. If he doesn't come
Key: 一、1. will be2. don't eat3. will feel4. relax
二、1—5ABACD