主将从现
主将从现是指在时间状语从句和条件状语从句中，如果主句是一般将来时，从句用一般现在时替代一般将来时。
常见的有以下四种情况：
一、条件状语从句的主句是一般将来时，那么从句常常用一般现在时 如： When I grow up, I’ll be a nurse and look after patients 我长大后要当一名护士，照顾病人
二、如果主句是祈使句，那么从句通常要用一般现在时 如：Don’t laugh at me when I make a mistake.
我犯错误的时候不要笑话我。
三、如果主句是含有情态动词的一般现在时，根据需要从句多用一般现在时 如：You should be quiet when you are in the reading room 在阅览室时应保持安静
四. 如果if的条件状语从句遇到变换间接和直接时 , 祈使句应用not to.... 如; She said not to close the window
常见的时间状语从句的连词有：as soon as, when, while ,as, until等 主将从现说的是在含有时间状语从句和条件状语从句的主从复合句中，如果主句的时态是一般将来时，那么从句要用一般现在时。例如：
I will tell him about it when he comes.
If it is fine tomorrow, we will go outing.
如果主句的时态是过去将来时，那么从句要用一般过去时。例如： He said that he would have another try if he had the chance. I knew he could help me if he was free the next day. 任务设计
任务I. 请用正确的形式填空。
1. If I come, I ________ ( see ) you.
2. If it is fine, we______( go ) for a walk.
3. If it rained, they _________ ( stay ) at home.
4. You will spoil it if you ______ ( not be ) careful.
5. We would be very much pleased if you _____( come ).
6. Will you help me if I _____ ( need ) you.
7. They will get wet if it _____ ( rain ).
8. What a pity I haven’t got my car. If I had, I _________( take ) you to the airport.
9. We would answer if we _____( can ).
10. If you eat too much, you ______( get ) ill.
任务II. 请根据给的线索将下列句子补充完整。
A．eg. 1. If I were trapped in a lift,____________________________.
2. If I had a flat tire on my way home,_____________________.
3. If I heard a noise outside my apartment in the middle of the night,
________________________________________________.
4. If someone was following me down a dark street, _________________.
5. If I were short of five yuan for a tennis racket, __________________.
6. If I found a wallet in the street with a lot of cash in it, __________.
B., I’d put it in the bank and
1. _____________________________, I’d leave my home city.
2.______________________________ , I might not speak to you again.
3._______________________________, I’d be very miserable.
watch it grow.
4. _______________________________, I’d be frightened.
5._______________________________, I’d be extremely happy.
任务III. 综合题：请根据上下文完成对话。
1. A: What are you doing this evening?
B: I’m not sure. If there _____ ( not be ) anything good on TV. I think I _______(read) a detective story. Or maybe I______ ( go ) to bed early.
2. A: What time will Kate be home?
B: If I ________(know) I ________(tell) you. But unfortunately, she didn’t say a word with
me because we argued yesterday.
A: Well, if she _____(get) home before 10:00, please ask her to call me.
3. A: I’m so stressed out.
B: It’s none of my business, but if I ________( be )you, I _______( take ) some time off.
4. A: I’m afraid your flight has been delayed due to bad weather.
B: Oh no! When will it take off?
A: We don’t have any idea yet. If it_________ ( stop ) snowing this evening, then your flight
_____________ (depart) some time tonight.
A: What are the chances that will happen?
B: It’s too early to tell. I ________( let ) you know if I ______( hear ) any news.
参考答案及分析
任务I 1. will see, 2. will go 3. would stay 4. are not 5. came
6. need 7. rains 8. would take 9. could 10. will get 任务II. A.
1. I would call up the police.
2. I would run to the repairing station.
3. I wouldn’t sleep at all.
4. I would run the fastest.
5. I would borrow it from my parents.
6. I would give it to the police.
B. 1. If I did something wrong
2. If you said something bad about me
3. If I had little pocket money
4. If I heard a strange noise at night
5. If I got good grades in the mid-term test,
任务III.
1．isn’t, will read, will go 2. knew, would, gets
3. were, would take 4. stopped, would, depart, will let, hear