1、if 引導的條件狀語從句 課本鏈接 If you do, you ll be sorry. Unit 5, Section A 定義 :if 引導的條件狀語從句表示假如從句的動作發生,主句的動作就（不）會發生； 句子結構 if 引導的條件狀語從句位置靈敏,可直接放在主句后面,也可以放在句首；放在句首時,從句后面 要用逗號和主句隔開；如： I llgo to seeyou if I have time如. 果有時間,我就去看 你； If it rains tomorrow, we ll stay a如t h果o明 me天. 下雨,我們就呆在家 里； 時態呼應 在復合句中： 當主句是一般現在時或是

2、一般將來時時；（ 2）當主句是祈使句時；（ 3）當主句含 有情態動詞時, if 引導的條件狀語從句通常用一般現在時； 用 法 例 句 主句為一般將來時態, if 從句用一般 We will stay at home if it rains tomorrow. 現在時態； （主將從現） 假如明天下雨,我將要呆在家； 主句中含有情態動詞, if 從句用一般現在 If you finish your homework, you can go home 時態； （主情從現）如： now. 假如你做完了作業,你現在可以回家了； may/might/can/could/must/should/would

3、主句為祈使句, if 從句用一般現在時態； Don t jump into the river if you feel very hot. 假如 （主祈從現） 你感到很熱,不要跳入河里； 玩兒刀是危 It s dangerous if you play with the knife. 主句為一般現在時時態, if 從句用一般現在 時態； （主現從現） 險的； 如： If she doesn t come, shewillbe so如rr果y.她不來,她會遺憾 的； Have a good rest if you are tired. 假如累了,你就好好休息一下； We must study h

4、ard if we want to pass the final exam.假如想通過期末考試,我們必需努力學習； 同義句轉換 1. 用“祈使句 and / or 一般將來時的句子 ”轉換；如： If you work hard, you llpass the exameaWsiolyr.k hard,andyou ll pass the exam easily. 努力學習,你將很簡潔通過考試； If you don t hurry up, you llmissthHeutrraryinu. p, oryou ll miss the train. 1第 1 頁,共 3 頁快點兒,否就你就趕不上

5、火車了； 2. 用含介詞 with 或 without 的介詞短語轉換；如： If there is no water, fish can Fisht lcivaen. t livewithoutwat離er 開水,魚不能生存； 【邊學邊做】 1. If there no buying and selling of animals, there no killing in nature. A. is; will he B. will be; will be C. is; is D. will be; is 2. The students have a sports meeting this w

6、eekend if it . A. won t; rains B. will; rains C. won t; will rain D. are going to; is going to 3. If you to the party, you ll have a great time. A. will go B. went C. go D. going 4.-What are you going to do tomorrow. -We ll go to the library tomorrow if it . A. isn t raiBn. rainC. won t rainD. doesn

7、 t rain 5. If I eat food, I ll be very fat. A. too many B. many too C. too much D. much too 6. I ll give the book to him if he here next Sunday. A. will come B. comes C. is coming D. came 7. Your teacher will be unhappy if you to school late. A. come B. will come C. are coming D. came 8. I don t kno

8、w if he . If he , please let me know. A. comes, comes B. will come, will come C. will come, comes D. comes, will come 9. If she here tomorrow, I will tell you. A. comes B. will come C. come D. came 2第 2 頁,共 3 頁10. Tom wants to know if you will have a picnic tomorrow. Yes. But if it play chess instea

9、d. A. will rain B. rained C. is raining D. rains 11. If Tom the game, well give him a surprise. A. win B. wins C. won D. miming 二,用所給詞的適當形式填空； 1. What will you buy if you （ have）a lot of money. 2. If it （ not snow） tomorrow, we will feel unhappy. 3. You mustn t go to school if you（b_e） stillinbed.4. If he （be）at home at that time, he would know it. 5. Pleaseshowme the way if you_know）it. 6. You will hurt your teeth if you （eat） too much candy. 7. If you gave me a toy car, I （be）very happy.