八年级上英语If引导的条件状语从句
- 格式:doc
- 大小:32.50 KB
- 文档页数:4
13夏八年级英语语法专项if引导的条件状语从句专项练习
I.条件状语从句的定义:
引导条件状语从句最常用的连词是if,常见的if条件状语从句表示在某条件下,某事很可能发生,条件是可能存在的,主句中某种情况发生的概率也是很高的。
If you ask him,he will help you.如果你请他帮忙,他会帮你的。
If you have finished the homework,you can go home.如果你作业做完了就可以回家了。
另外,if从句还表示不可实现的条件或根本不可能存在的条件,也就是一种虚拟的条件或假设。从句多用一般过去时或过去完成时,表示对现在或过去的一种假设。如:
If I were you,I would invite him to the party.如果我是你,我会邀请他参加聚会。
I would have arrived much earlier if I had not been caught in the traffic.
要不是交通堵塞,我本会来得早一些。
Ⅱ条件状语从句的引导词
引导的条件状语从句:表示在某种条件下某事很可能发生。
If we pay much attention to the earth, we'll have a better world.
如果我们多关爱地球,就会拥有一个更美好的世界
If it rains tomorrow, what shall we do?
如果明天下雨,我们怎么办?
注意:if还可以引导虚拟条件句,表示不可实现的条件,从句中多用一般过去时或过去完成时。What would happen if there were no water ?
如果没有水会怎样?
引导的条件状语从句:unless的意思是如果不,除非。可与if...not互换。
You will fail in English unless you work hard.你英语考试会不及格的,除非你更加努力。
/so long as引导的条件状语从句:as /so long as意思是“只要”
So long as you're happy,i will be happy.只要你高兴,我就高兴。
Ⅲif 条件句的时态搭配
1.if从句用一般现在时,主句用一般将来时
If he runs he’ll get there in t ime. 如果他用跑的,他就会及时赶到那儿。
The cat will scratch you if you pull her tail. 如果你拉猫的尾巴,它就会抓你。
2.if 从句用一般现在时,主句用may/might/can
If the fog gets thicker the plane may/might be diverted.
如果雾在大一些,飞机可能就会改在别的机场降落。
If it stops snowing we can go out. 如果雪停了,我们就可以出去。
3.if 从句用一般现在时,主句用must/should
If you want to lose weight you must/should eat less bread. 如果你想减肥,你必须少吃面包。
4.if 从句用一般现在时,主句用一般现在时
If you heat ice it turns to water. (也可用will turn)如果把冰加热,它就会化成水。
5.if 从句用现在进行时,主句用一般将来时
If you are looking for Peter you’ll find him upstairs . 如果你是在找彼得,上楼就会找到他。
6.if 从句用现在完成时,主句用一般将来时
If you have finished dinner I’ll ask the waiter for the bill. 如果你吃完了,我就叫服务生来算账 Ⅳ条件状语从句的时态原则
V . 注意 :学习" if " 引导的条件状语从句的用法,现在总结一下:
if 条件句不一般,几个要点记心间; 条件句 从句 主句
真实 一般现在时 一般将来时
情态动词+动原
祈使句
非真实
一般过去时
be 动词用(were )
would/could+动原
条件句,放在前, 逗号要放句中间。
条件句表真实,主将从现要遵从;
条件句非真实,虚拟语气用到位。
备注:在if 引导的条件状语从句中,if 和条件句位置灵活,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。还要注意前后时态一致原则。
if引导的条件状语从句专项练习
Ⅰ.单项选择
()you _____ to the party, you’ll have a great time.
A. will go
B. went
C. go
D. going
()2. I ____ her the answer if she ____me.
A. can tell, will ask
B. will tell, will ask
C. would tell, ask
D. will tell, asks
()3. – What are you going to do tomorrow?
--We’ll go to the library tomorrow if it ___.
A. isn’t rain
B. rain
C. won’t rain
D. doesn’t rain
()4. What will you do if you _____ to the old folk’s home?
A. go
B. went
C. going
D. will go
()5.I’ll give the book to him if he ___ here next Sunday.
A. will come
B. comes
C. is coming
D. came
Ⅱ.用所给词的适当形式填空
6..If you ________(feel) tired, you _______________ (have) to have a rest.
7. Where _______ he _________(see) the film if he ________________(have) time?
8. If there __________(be) fewer trees, there _______________( be) more pollution.
9. If Marcia _____________(live) alone, she ___________________( keep) a pet parrot.
11. Lana ________________( buy) a new dress if the old one ____________(be) out of style.
twins ______________(fight) if they_______________(argue).
13. I ____________(have) a bake sale if I _____________(need) money for education.
14. Peter _____________( send) me a beautiful souvenir if he ________________(tour) Spain.
15. I ____________(go) to the beach if it________________ ( not rain) this week.
17. __________they __________( have) a match if the . teacher _____________(be) busy?
18. If she ____________(get) up late, she _____________ ( not catch) the early bus.
Ⅲ.翻译下列句子
19..如果他到的晚了会发生什么事情?
What _______________ if he _____________ late?
20. 如果努力学习,你就会取得好成绩。
If you__________ _________, you good marks.