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语法专题：条件状语从句
（1）if条件句：有可能性结果发生的行动，在这些句子中，动词的时态是不同的，if 引导的条件状语从句中，主句用一般将来时态，从句用一般现在时态（主将从现）
If it doesn’t rain（从句）, we’ll have a picnic tomorrow（主句）.
We’ll have a picnic tomorrow, if it doesn’t rain.（if引导的从句可置前可置后）
（2）主祈从现（祈使句+if+一般现在时态）
Put up your hands if you have any questions to ask. 如果你们有问题问的话，请举手。
当主语是you时， if 引导的条件状语从句可以与”祈使句+and/ or +简单句”进行句型转换。 And 表示句意顺承，or 表示转折， 意为”否则”。
Take care , or you will fall off the tree. = If you don’t take care, you’ll fall off the tree. 小心， 否则你会从树上掉下来。
（3）主情从现（情态动词+if +一般现在时态）
If I get there early, I can see the doctor quickly.
（4）句型：
will do式 be going to do式
肯定从句 If主语+动词+其他, 主语+will(won’t) do+其他. If主语+动词+其他, 主语+be(be not) going to do+其他.
否定从句 If主语+be+not+其他, 主语+will(won’t) do+其他. If主语+be+not+其他, 主语+be(be not) going to do+其他.
If主语+don't/ doesn't +动词原形+其他, 主语+will(won’t) do+其他. If主语+don't/ doesn't +动词原形+其他, 主语+be(be not) going to do+其他.
If the picture is silly, strange and colourful, you will remember it better.
If I have time, I am going to visite you .
I will go to the park if it doesn’t rain tomorrow . I won't go to the park if it rains tomorrow.
题型1：单项选择
( ) 1. If the robot ___________ wrong，you can get a new one for free or get all your money back.
A. went B. goes C. would go D. will go
( ) 2. —We’ll go for a picnic if it ___________ on Sunday.
—Wish you a lovely weekend.
A. rain B. doesn’t rain C. won’t rain D. rains
( ) 3. I’ll do it better if the teacher ___________ me another chance.
A. give B. gives C. gave D. will give
( ) 4. If a polar bear ___________, it ___________ fish from the water
A. will be hungry；catches B. is hungry；will catch
B. is going to be hungry；catches D. is hungry；won’t catch
( ) 5. If our government ___________ attention to controlling food safety now, our health ___________ in danger.
A. won’t pay; is B. doesn’t pay; is C. won’t pay; will be D. doesn’t pay; will be
( ) 6. We will go for a picnic if it___________ tomorrow.
A. doesn’t rain B. wasn’t rainy C. won’t rain D. wasn’t raining
( ) 7. If the pure water is heated to 100 centigrade degrees, it___________ boil.
A. is going to B. will C. would D. is to
( ) 8. She will go to America___________ she has much free time and money.
A. as long as B. but C. though D. although
( ) 9. We will go to the West Lake___________ it doesn’t rain heavily tomorrow.
A. if B. unless C. as long as D. once
( ) 10. I won’t call you, ___________ something unexpected happens.
A. unless B. whether C. because D. While
Keys: 1-5 BBBBD 6-10ABAAA
题型2：以所给词的正确形式填空
1. If he ________ (study) hard, he will get good grades.
2. Everyone must wear uniforms. If you don't, they ___________ (let) you in.
3. If you stand at the top of the mountain, you _________ (see) the view of the whole city.
4. My grandfather will wear a pair of glasses if he__________ (read) newspapers.
5. Please turn off the light if you ________ (leave) the classroom.
6. We’ll go for a picnic unless it ________(rain) this Sunday.
7. Mr Smith ________ (let) you know if he needs help.
8. If you walk along the street, you ________ (see) many foreigners.
9. If Mary ________ (ask) me for help，I will try my best to help her.
10. I don't know if it will snow tomorrow. If it_______ (snow)，we'll make snowmen.
Keys:1. Studies 2.won’t let 3. will see 4. reads 5.leave
6.doesn’t rain 7.will let 8.will see 9. asks 10.snows
题型1：单项选择
( ) 1.—I wonder if your wife ________ to the party.
—If your wife _________, so will mine.
A. will go, go B. will go, goes
C. goes, will go D. will go, will go
( ) 2. If he _________ in half an hour, we _________ wait for him.
A. won't come, won't B. won't come, don't
C. doesn't come, won't D. will come, don't
( ) 3. I will send you an e-mail as soon as I_________ in Canada.
A. arrive B. arrived C. am arriving D. will arrive
( ) 4. If there ________ no buying and selling of animals, there _________ no killing in nature.
A. is; will be B. will be; will be C. is; is D. will be; is
( ) 5. You can’t watch TV ________ you finish your homework.
A. before B. if C. while D. as
Keys:1-5:ACAAA

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