2022年中考英语复习If引导的条件状语从句课件（共有PPT16张）

(共16张PPT)
初中英语
if引导的条件状语从句
eg:如果我有足够的钱，我就去环游世界
If 引导条件状语从句
定义：if “如果, 假如” 它引导的句子表示某事发生所需的条件，即“在…条件下，某事才能发生”，在句子中充当状语，因此称之为条件状语从句。
If I have enough money, I will travel around the world
orI will travel around the world if I have enough money
__________________
if I’m ill.
I will see a doctor
Look and say
If I’m late,
_________________.
I will say sorry
位置：从句可放在主句之前或之后，但是放在主句之前须有逗号隔开，放在主句后则不用

If it rains tomorrow,
I_____________________.
will watch TV at home
If it _____________ tomorrow,
________________.
he’ll play basketball
doesn’t rain
用法：
1. 如果主句是一般将来时，从句则用一般现在时（主将从现）。
If it rains（从句）， I will stay at home.
I’ll go with you if you don’t want to go alone（从句）.
2.如果主句含有must, may, can 等情态动词，从句也要用
一般现在时（主情从现）。
If you drive too fast, you may have an accident.
You must stop if the traffic is red.
If you finish the homework， you can go home．
如果你作业做完了就可以回家了。
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。
3. 如果主句是祈使句，从句同样要用一般现在时（主祈从现）。
Don’t go and play football if you don’t finish your homework.
Please call me if he comes next Sunday.
4.如果if引导的条件状语从句说的是客观事实或者是普遍规律的话，从句和主句都用一般现在时
eg.If you drop a glass,it breaks.
If you heat ice, it melts
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/or+一般将来时的句子”
You can pass the exam if you work hard.
----------------，and you will pass the exam.
If you don't hurry up,you will be late again.
Hurry up,------ you will be late again.
Work hard
or
2. 借助介词with 或without来转换。
例如:
If you help me, I’ll finish my job soon.
　　
------------------, I’ll finish my job soon.
　　如果你帮我，我将很快完成我的工作。
　　If there is no water, fish may die.
　　
Fish may die ------------------.
　　如果没有水，鱼可能会死。
With your help
without water
注意事项
1. 在if引导的条件状语从句中，当主句是一般将来时时，不能够使用be going to结构，而要用will。
例如： I’ll help you with your English if I am free tomorrow. 如果明天我有空，我会帮你学英语。
2. 在if引导的条件状语从句中不能够使用some，而要用any。
例如： If you have any questions to ask, please come to my office. 如果你有问题要问的话，请到我办公室来。
练习：
1、如果明天不下雨，我就和同学们去野餐。
2、如果你起来晚了，你上学将迟到。
3、如果你想节约能源，你应该骑自行车。
4、如果朋友有麻烦，我们应该尽力帮助他们。
If it doesn’t rain tomorrow, I will have a picnic with my classmates.
If you get up late, you’ll be late for class.
You should ride your bike if you want to save energy.
If our friends have troubles,we should try ou best to help them.
More practice
1.If you ______ (drop) a glass, it ______ (break).
2.He ______ (fail) in the exam if he ______ (not study) hard.
3.Unless you ______ (leave) now, you ______(be) late.
4.We ______ (have) a barbecue unless it ______ (rain) .
5.If you ____ (cool) water, it _____(turn) into ice.
6.Hurry up, or you will miss the bus.
___ you don’t hurry up, you ____ catch the early bus.
7.Study hard, or you’ll miss fall behind.
______ you study hard, you______ fall behind.
8.If you don’t put on your scarf, you’ll catch cold.
Put on your scarf, _____ you’ll catch cold.
9.The insurance company would pay him 2 million yuan if the vase was stolen.
The insurance company _____ pay him 2 million yuan _____ the vase was stolen.
10.I don’t know if it_______ tomorrow. If it ____ ,I won’t go shopping. (rain)
drop
breaks
will fail
doesn’t study
leave
will be
will have
rains
cool
turns
If
won’t
Unless
will
or
won’t
unless
will rain
rains
Have a try 用括号内所给词的正确形式填空
1.I’m sure if he _____(go) to the party, he________ (have) a great time.
2.If the rain _______(stop) tonight, we will go to the cinema.
3.I’ll buy a computer if I ______(have) enough money.
4.You _________(not get) nervous if you _____(do ) enough exercise.
5.If she ____ (be) kind to me , I __________(not argue) with her.
6.I want to know if he _________(come) tomorrow, if he _______(come), I __________(give) the massage to him.
7.If you _____(pay) more attention to that, he _________ (not get) injured.
goes
will have
stops
have
won’t get
do
is
won’t argue
comes
comes
will give
pay
won’t get
8.Mr Li will be mad if we _______(break) the rules.
9. If it _____ (be) cloudy, they _______(not go) there by air.
10. Please let us know if he ________(arrive) tomorrow.
Please let us know if he _________ (arrive) tomorrow.
11.Shall I say “Hello” when the foreigner ______(come) into the classroom
12.He’ll get better grades if he _________ (study )hard.
13. If you work really hard, you _______
(be) famous and rich.
break
is
won’t go
will arrive
arrives
请告诉我们他明天是否会来。
如果他明天来的话请告诉我们。
comes
studies
will be
表是否，用将来时态
表如果，用一般现在时态