1、主将从现常见的有以下四种情况：一、如果主句是一般将来时，那么从句常常用一般现在时。如： When I grow up, Ill be a nurse and look after patients. If it is fine tomorrow, we will go boating.二、如果主句是祈使句，那么从句通常要用一般现在时。如：Dont laugh at me when I make a mistake.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. 常见
2、的时间状语从句的连词有：as soon as,when,while ,as,until等,条件状语从句的连词有：as long as,unless,if等。I will tell him about it when he comes.注意：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.练习：（ ）1. If you want to learn English w
3、ell, you must use it as _ as possible.A. often B. long C. many D. soon（ ）2. -What will Bill do if he _in the test?-He will try again.A. fail B. fails C. will fail D. is failing ( ) 3. Please tell her the news when she_. OK, I will.A. comes B. will come. C. come D. would come( ) 4. The students will
4、plant trees if it _ tomorrow.A. didnt rain B. hasnt rained C. wont rain D. doesnt rain( ) 5. We_ home if there is no bus. -Oh, what a pity!A. will walk B. have walked C. walked D. walk( ) 6 . If it _ tomorrow, Ill go by car.A. rain B. will rain C. rains D. would rain( )7. If Mary _ next Sunday, we w
5、ill go boating together.A. will come B. comes C. shall come D. should come( )8. - Dont forget to ask him to write to me. - I wont. As soon as he _, Ill ask him to write to you.A. will come B. came C. comes D. is coming ( )9. - _ the young girl _ the old man clean his room every day?- Yes, she does.A
6、. Does; help B. Has; helped C. Did; help D. Do; helps( )10. - What does Linda often do in the evening?- She often _ her homework, but on the evening of March 12 she _ TV.A. does; watches B. is doing; watched C. does; watched D. is doing; was watching( )11. Our geography teacher told us yesterday tha
7、t the earth _ around the sun.A. was moving B. moved C. has moved D. moves ( )12. - Do you like this silk dress?- Yes, I do. It _ so soft and comfortable.A. is feeling B. feels C. has felt D. is felt ( )13. - Can I go to Beijing for my holiday, Dad?- You can when you _ a bit older.A. will get B. get
8、C. are getting D. got( )14. If he _harder, he will catch up with us soon. A. study B. studies C. will study D. studied( )15. Frank _ to see his grandma if he _ free tomorrow.A. will come; will be B. comes; is C. will come; is D. comes; will be( ) 16. When will you tell him the good news? -I will tell him about it as soon as he _ back. A. comes B. came C. will come D. is coming
