1、第五講if 條件句姓名：學校：年級：【學習目標 】：1. 了解 if 條件句，及其用法2. 通過讀寫訓練，掌握if 條件句的用法【知識要點】定義：常見的 if 條件狀語從句表示在某條件下，某事很可能發生，條件是可能存在的，主句中某種情況發生的概率也是很高的。E.g. If you ask him， he will help you 如果你請他幫忙，他會幫你的。E.g. If you fail in the exam ， you will let him down 如果你考試不及格，你會讓他失望的。E.g. If you have finished the homework， you can g

2、o home如果你作業做完了就可以回家了。另外，if 從句還表示不可實現的條件或根本不可能存在的條件， 也就是一種虛擬的條件或假設。 從句多用一般過去時或過去完成時， 表示對現在或過去的一種假設。， I would invite him to the party 如果我是你，我會邀請他參加聚會。要不是交通堵塞，我本會來得早一些。另外你還要注意if 條件句的時態搭配1if 從句用一般現在時，主句用一般將來時E.g. If he runs he ll get there in time.如果他用跑的，他就會及時趕到那兒。E.g. The cat will scratch you if you pu

3、ll her tail.如果你拉貓的尾巴，它就會抓你。2if 從句用一般現在時，主句用may/might/canE.g. If the fog gets thicker the plane may/might be diverted.如果霧在大一些，飛機可能就會改在別的機場降落。E.g. If it stops snowing we can go out.如果雪停了，我們就可以出去。3if 從句用一般現在時，主句用must/shouldE.g. If you want to lose weight you must/should eat less bread.如果你想減肥，你必須少吃面包。4i

4、f 從句用一般現在時，主句用一般現在時E.g. If you heat ice it turns to water. (也可用 will turn)如果把冰加熱，它就會化成水。5if 從句用現在進行時，主句用一般將來時E.g. If you are looking for Peter you ll find him upstairs.如果你是在找彼得，上樓就會找到他。6if 從句用現在完成時，主句用一般將來時E.g. If you have finished dinner I llaiteraskforthethew bill.如果你吃完了，我就叫服務生來算賬注意 ：學習 " if

5、"引導的條件狀語從句的用法,現在總結一下 :if 條件句不一般 ,幾個要點記心間 ;條件句 ,放在前 ,逗號要放句中間。條件句表可能，主句多用將來時；條件句表事實，主句常用現在時。在 if 引導的條件狀語從句中，如果從句談論的是一個有可能發生的事實及其產生的相關的結果，主句用一般將來時態，從句用一般現在時態。如：E.g. We can walk there if we can't find a bus .E.g. If it rains tomorrow ,we will not goto the zoo.E.g. What will youdo if youfind a p

6、anda in danger.如果 if 條件句談論的是重復發生和預示要發生的情景和事件，則主從句大多用一般現在時態。E.g. If bears are in danger ,they attack people.在 if 引導的條件狀語從句中， if 和條件句位置靈活，可直接放在主句后面，若if 條件句放句首，從句后面要加逗號，和主句隔開。還要注意前后時態一致原則【經典練習】一 .單項選擇（）1. If you _ to the party, youll have a great time.A. will goB. wentC. goD. going（）2. It will be a lon

7、g time _ Peter _ his work.A.since, has finishedB. after, finishesC. when, will finishD. before, finishes.（）3. What will father _ us from Japan?A. takeB. bringC. carryD. make（）4. Weifang is famous _ kites.A. forB. toC. onD. with（）5 I _ her the answer if she _me.A. can tell, will askB. will tell, will

8、 askC. would tell, askD. will tell, asks（）6. What are you going to do tomorrow?-We ll go to the library tomorrow if it _.A. isn t rainB. rainC. won t rainD. doesn t rain（）7. Do you know when he will come back tomorrow?-Sorry, I don t know. When he _ back, I ll tell you.A. comesB. will comeC. comeD.

9、may come（）8. What will you do if you _ _ to the old folks home visit?A. goB. wentC.goingD. will go（）9. If I eat _ food, Ill be very fat.A. too manyB. many tooC. too muchD. much too（）10. I ll give the book to him if he _ here next Sunday.A. will comeB. comesC. is comingD. came（）11. There _an English

10、film in our school tomorrow.A. is going to haveB. will haveC. is going to beD. has（）12. Could you tell us where _？A. will the next Olympic Games heldB. the next Olympic Games will be heldC. would the next Olympic Games be heldD. the next Olympic Games would be held1-5 CDBAD6-12 DAACBCB二在正確的答案下劃一條線。1

11、. Daina ( will go/go/goes) to Europe if she (will pass/pass/passes) the exams .2. The graduates (will teach/teach/teaches)in the poor village if the Ministry of3. If there (will be/ are/is) a car accident, they (will call/call/calls) 110 for help at once.4. If it (won t/don t/doesn t/ isn t) rainy,

12、we (will take/ take/takes) walk outside.5. If a UFO (will land/land/lands) in front of me, I (will go/go/goes) in to look for the alien.6. If he (will have/have/has) money, he (will bulid/build/builds) a science lab.7.Don t wait for me if I (am/ will be) late.8.They (won t/don t) go to the beach if

13、it (will rain/rai/rains).9. I (will call/ call) you if he (will stay/stay /stays) at home.10. Mr Smith (will let/ let/lets) you know if he (will need/ need/ needs) help.11.(Will / Do/ Does) he visit the museum if he (won t / dontired? t/ doesn t) get12.Where (will/ do/does) they live if they (will m

14、iss/ miss/ misses) the bus?三、用所給詞的適當形式填空1.If you _(feel) tired, you _ (have) to have a rest.2. Where _ he _(see) the film if he _(have) time?3. If there _(be) fewer trees, there _( be) more pollution.4. He _(dress) more casually if he _( not work) on weekends.5. If Marcia _(live) alone, she _( keep)

15、 a pet parrot.6. Lana _( buy) a new dress if the old one _(be) out of style.7.The twins _(fight) if they_(argue).8. I _(have) a bake sale if I _(need) money for education.9. Peter _( send) me a beautiful souvenir if he _(tour) Spain.10. If Mr Green _(say) I am hard- working, my parents _( feel)glad.

16、11. I _(go) to the beach if it_ ( not rain) this week.12. _they _( have) a match if the P.E. teacher_(be) busy?13.He _(write) a letter to his grandparents if he _(get) his report card this week.14. If she _(get) up late, she _ ( not catch) the early bus.15.Peter_(major)inEnglishifhe_(pass) theexamsi

17、nPeking University.三翻譯句子1.如果他到的晚了會發生什么事情？What _ if he _ late?2. 如果努力學習，你就會取得好成績。If you_ _, you _ good _.3. 他如果看電視太久了，他的父母會不高興。If he _ TV too much, his parents _ _ unhappy.4. 如果我們為他組織生日聚會，大家都會來的。Everyone _ if we _ a birthday party _him.5. 如果明天不下雨，我會和你一起去公園的。Ifit _ _ tomorrow, I _ go to the park_ you.6. 如果她睡過頭了，就會旅游遲到的。She_ the trip if she _.7. 如果他有空，他會幫助你的。If he _, he _you.8. 如果