初中英語If引導(dǎo)的條件狀語從句(共6頁)

1、精選優(yōu)質(zhì)文檔-傾情為你奉上初中英語if引導(dǎo)的條件狀語從句在 if 引導(dǎo)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(shí)態(tài)一致原則.引導(dǎo)條件狀語從句的連接詞主要有：if(如果）、unless（除非）或 as long as（只要）等。unless在意思上等于if.not。        一、條件狀語從句用法        1、引導(dǎo)條件狀語從句最常用的連詞是if,由if引導(dǎo)的條

2、件狀語從句表示在某種條件下某事很可能發(fā)生。如：        If you ask him, he will help you.如果你請他幫忙,他會(huì)幫你的。         If you fail in the exam, you will let him down.如果你不及格,你會(huì)讓他失望的。         另外,if從句還表示不可實(shí)現(xiàn)的條件或根本不可能存在的條件,也就是一種虛擬的

3、條件或假設(shè),從句多用一般過去時(shí)或過去完成時(shí)。如: If I were you, I would invite him to the party.如果我是你,我會(huì)邀請他參加聚會(huì)。          2、unless = if.not. 除非,若不,除非在的時(shí)候         例如：Let's go out for a walk unless you are too tired.     &

4、#160;    =If you are not too tired, let's go out for a walk.         Unless it rains, the game will be played.除非下雨,比賽將照常進(jìn)行。        二、時(shí)態(tài)問題        在條件狀語從句中，要注意“主將從現(xiàn)”的規(guī)定，即主句用

5、一般將來時(shí)，從句用一般現(xiàn)在時(shí)表示將來時(shí)。例句：I will come to see you if I have time. 我有時(shí)間，我就來看你。三 如果 if 條件句談?wù)摰氖侵貜?fù)發(fā)生和預(yù)示要發(fā)生的情景和事件，則主從句大多用一般現(xiàn)在時(shí)態(tài)。如： If bears are in danger ,they attack people.誤區(qū)提醒        if 既可以引導(dǎo)條件狀語從句，表示“如果”，也可以引導(dǎo)賓語從句，表達(dá)“是否”。辨別它在這兩種從句中的時(shí)態(tài)是我們經(jīng)常容易出錯(cuò)的地方。另外，if 和unless的用法也需注意。&#

6、160;       典型例題： -I wonder if your wife    to the party.           -If your wife _, so will mine。.          A. will go， go      &#

7、160; B. will go,  goes           C.goes, will go         D. will go, will go        解析：第一句中if表示“是否”，引導(dǎo)賓語從句，用將來時(shí)will go；第二句“如果你的妻子去，我的妻子也去”，if引導(dǎo)條件狀語從句，用一般現(xiàn)在時(shí)表示將來時(shí)。 your wi

8、fe，單三人稱主語，所以用goes  。總結(jié)IF引導(dǎo)的 一、表示將來可能發(fā)生的： (1) If sb does sth, sb will do sth = sb will do sth if sb does sth 主句一般將來時(shí) 從句一般現(xiàn)在時(shí)(2)主句為祈使句或情態(tài)動(dòng)詞形式If sb does sth, please do sth If sb does sth, sb may(情態(tài)動(dòng)詞) do sth 二、表必然發(fā)生的If sb does sth, sb/sth does sth = sb/sth do sth if sb does sth 主句一般現(xiàn)在時(shí)， 從句一般現(xiàn)在時(shí)（相當(dāng)

9、于when引導(dǎo)的從句）Unless引導(dǎo)的sb will do sth unless sb does sth if sb does not do sth 練習(xí)1.He _ (fail) in the exam if he _ (not study) hard.2.Unless you _ (leave) now, you _(be) late.3.We _ (have) a barbecue unless it _ (rain) .4.Hurry up, or you will miss the bus.（同義句轉(zhuǎn)換） _ you dont hurry up, you _ catch the e

10、arly bus.5.Study hard, or youll miss fall behind. （同義句轉(zhuǎn)換） _ you study hard, you_ fall behind.6.If you dont put on your scarf, youll catch cold. （同義句轉(zhuǎn)換） Put on your scarf, _ youll catch cold.7.I dont know if it_ tomorrow. ）(表是否，用將來時(shí)態(tài))If it _ ,I wont go shopping. (rain) （表如果，用現(xiàn)在時(shí)態(tài)）8.I want to know if

11、he _(come) tomorrow, if he _(come), I _(give) the massage to him. 9. Please let us know if he _(arrive) tomorrow. 請告訴我們他明天是否會(huì)來 Please let us know if he _ (arrive) tomorrow.如果他明天來的話請告訴我們10.Im sure if he _(go) to the party, he_ (have) a great time.11.If the rain _(stop) tonight, we will go to the cine

12、ma.12.Ill buy a computer if I _(have) enough money.13.You _(not get) nervous if you _(do ) enough exercise.14.If she _ (be) kind to me , I _(not argue) with her.15.If you _(pay) more attention to that, he _ (not get) injured.16.Mr Li will be mad if we _(break) the rules.17. If it _ (be) cloudy, they

13、 _(not go) there by air.18.Shall I say “Hello” when the foreigner _(come) into the classroom?19.Hell get better grades if he _ (study )hard.20. If you work really hard, you _ (be) famous and rich.if 條件狀語從句的時(shí)態(tài)練習(xí) 一在正確的答案下劃一條線。1.Daina ( will go/go/goes) to Europe if she (will pass/pass/passes) the exam

14、s .2. The graduates (will teach/teach/teaches) in the poor village if the Ministry of Education (will agree/ agree/agrees) soon.3. If a UFO (will land/land/lands) in front of me, I (will go/go/goes) in to look for the alien.4. If he (will have/have/has) money, he (will bulid/build/builds) a science

15、lab.5.Dont wait for me if I (am/ will be) late.6.They (wont/dont) go to the beach if it (will rain/rain /rains).7. I (will call/ call) you if he (will stay/stay /stays) at home.8. (Will / Do/ Does) he visit the museum if he (wont / dont/ doesnt) get  tired?9. Where (will/ do/does) they live if

16、they (will miss/ miss/ misses) the bus?二、用所給詞的適當(dāng)形式填空1.If you _(feel) tired, you _ (have) to have a rest.3. If there _(be) fewer trees, there _( be) more pollution.5. If Marcia _(live) alone, she _( keep) a pet parrot.6. Lana _( buy) a new dress if the old one _(be) out of style.7.The twins _(fight)

17、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.11.I _(go) to the beach if it_ ( not rain) this week.12. _they _( have) a match if the P.E. teac

18、her _(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) in English if he _(pass) the exams in Peking  University.單項(xiàng)選擇（15分）1.If you _ to the party, youll have a great time. A.

19、 will go  B. went  C. go   D. going2. It will be a long time _ Peter _ his work. A. since, has finished   B. after, finishes   C. when, will finish   D. before, finishes.3. What will father _ us from Japan? A. take   B. bring   C.

20、 carry   D. make 4. Weifang is famous _ kites. A. for   B. to   C. on   D. with5 I _ her the answer if she _me. A. can tell, will ask   B. will tell, will ask  C. would tell, ask   D. will tell, asks6. What are you going to do tomorrow? -Well go to the library tomorrow if it _. A. isnt rain