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1、主将从主将从现现 主将从主将从现现：是指在：是指在时间时间状状语语从句和条件状从句和条件状语语从句中从句中，主句是一般将来主句是一般将来时时，从句用一般从句用一般现现在在时时 （标志词） if as long as unless when + 从 句， 主 句. while （一般现在时） （一般将来时） as soon as until before 引引导导条件状条件状语语从句的从句的词词 （ （if、 、as long as、 、unless） ） If you ask him, he will help you. As long as you ask him, he will help
2、 you. Ill go there tomorrow unless it rains. 引引导时间导时间状状语语从句的从句的词词 when , while , before , after , until , till , since , as soon as , 1.主将从主将从现现 主句是一般将来时，从句用一般现在时。 When I grow up, Ill be a doctor. If he goes to the party, you will be happy. 2.主祈从主祈从现现 主句是祈使句，从句用一般现在时。 Dont laugh at me when I make a
3、mistake. Put it in your diary before you forget. 用记事本记下免得忘了。 3.主情从主情从现现 主句中含有情主句中含有情态动词态动词，从句用一般，从句用一般现现在在时时。 。 You should be quiet when you are in the reading room. A baby deer can stand as soon as its born. 小鹿一生下来就能站着。 You can get a better job if you speak a foreign language. 要是你会说一种外语，那你就会找到更好的工作
4、。 通常出通常出现现情况情况 1. “主将从主将从现现”用于用于时间时间状状语语从句从句 As soon as I get through with my work Ill join you. 我工作一做完就来找你们。 Before they drive any of the buses, they will have to pass a special test. 然而在驾驶公共汽车前,他们必须通过专门测验。 My mother will be very angry with me when she finds out where Ive been. 我母亲要是知道我到过那地方一定会大怒。
5、Well pay you half up front and the other half when youve finished the job. 我们先付给你一半钱，剩下的一半等你干完了再付。 2. “主将从主将从现现”用于条件状用于条件状语语从句从句 If (it is) necessary I will come at 6. 如有必要，我6点钟来。 If today is Wednesday, the day after tomorrow will be Friday. 今天要是星期三，后天就是星期五。 If you train hard, youll make a good foot
6、baller. 你要刻苦训练就能成为优秀的足球运动员。 If past experience is anything to go by, the plane will be late. 过去的经验要是还靠得住的话，这飞机会晚点的 3. “主将从主将从现现”用于用于让让步状步状语语从句从句 Well go even if it rains. 即使下雨我们也去。 Hell come even if hes ill. 他即使生病也会来。 Even if he had the money, he wouldnt buy it. 他即使有钱也不会买它。 Hell probably say no, tho
7、ugh its worth trying. 他很可能不同意，但不妨去试探一下 【Exercise 】 练习1. If I come, I _ ( see ) you. 2. If it is fine, we_( go ) for a walk. 3. If it rains, they _ ( stay ) at home. 4. You will spoil it if you _ ( not be ) careful. 5. We will be very much pleased if you _( come ). 6. Will you help me if I _ ( need )
8、 you. 7. They will get wet if it _ ( rain ). 8. We will answer if we _( can ). 9. If you eat too much, you _( get ) ill. ( ) 10. -What will Bill do if he _in the test?-He will try again. A. fail B. fails . will fail D. is failing ( ) 11. Please tell her the news when she_. OK, I will. A. comes B. wi
9、ll come. C. come D. would come ( ) 12. The students will plant trees if it _ tomorrow. A. didnt rain B. hasnt rained C. wont rain D. doesnt rain ( ) 13. We_ home if there is no bus. -Oh, what a pity!A. will walk B. have walked C. walked D. walk ( ) 14 .If it _ tomorrow, Ill go by car. A. rain B. wil
10、l rain C. rains D. would rain ( ) 15.If Mary_next Sunday, we will go boating together. A. will come B. comes C. shall come D. should come ( ) 16. - 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 ( )17. - Can I
11、go to Beijing for my holiday, Dad? - You can when you _ a bit older. A. will get B. get C. are getting D. got ( )18. If he _ harder, he will catch up with us soon. A. study B. studies C. will study D. studied ( )19. Frank _to see his grandma if he _ free tomorrow. A. will come; will be B. comes; is
12、C. will come; is D. comes; will be 【拓展练习】 （ ）1. If you want to learn English well, 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_
13、. OK, I will. A. comes B. will come. C. come D. would come ( ) 4. The students will 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, Il
14、l go by car. A. rain B. will rain C. rains D. would rain ( ) 7. If Mary _ next Sunday, we will go boating together. A. will come B. comes C. shall come D. should come ( )8. - Dont forget to ask him toto me. - I wont. As soon as he _, Ill ask him toto you. A. will come B. came C. comes D. is coming (
15、 )9. - _ the young girl _ the old man clean his room every day? - Yes, she does. A. 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
16、; watched D. is doing; was watching ( )11. Our geography teacher told us yesterday that the earth _ around the sun. A. was moving B. moved C. has moved D. moves ( )12. - Do you like 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; C. are getting D. got ( )14. If he _ harder, he will catch up with us soon. A. study B. studies C. will study D.
