主将从现及练习.doc

主将从现
概念：在时间状语从句和条件状语从句中，主句用一般现在时从句则用一般现在时表示一般将来。
适用条件：1. 主句和从句的动作都是将来要发生的动作
2.在时间状语从句和条件状语从句中
时间状语从句的关联词有：after在-----以后， before在-----以前 when当----的时候，as soon as一-----就------ until到----为止
条件状语从句的关联词有：if如果和unless除非，如果不
首先要分清主句和从句：
如：When I grow up, I will be a nurse and look after patients.
I want to be a doctor when I grow up.
注意：无论主句和从句都可以在前面或者后面，紧跟在关联词后的才是从句。
其次，还要注意主句的各种变体。主句可以是标准的将来时：will+动词原形或者be going to+动词原形也可以是一下两种情况：
1、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。
2、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.
最后：当主句是过去将来时时，从句用一般过去时表示过去将来。
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.
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.