由if和unless引導的條件狀語從句

1、由if和unless引導的條件狀語從句1. Ifweloseourshort-termmemory,weforgetthingshappeningrecently.譯：2. Ifthepictureissilly,strangeandcolorful,youwillrememberitbetter.譯：A:Ifsentences:actionswithdefiniteresults.有必然結果發(fā)生的行動eg:Ifyougointoaclothesshop,youfindclothes. Ifyougointoacarshowroom,youseecars. Waterturnsintoicei

2、fyoucoolit. Thewoodfloatsifyouputitintowater.Conclusion:1）.如果if條件句談論的是重復發(fā)生和預示必定要發(fā)生的情景和事件，則主從句大多用一般現在時態(tài)。2）.在if條件句中，if條件從句可以放在前面，也可以放在后面。當if引導的條件從句放在前面時，后面常用逗號隔開。B:Ifsentences:actionswithpossibleresults.有可能性結果發(fā)生的行動eg:Ifyouaskhim，hewillhelpyou如果你請他幫忙，他會幫你的。Ifyoufailintheexam，youwilllethimdown在if引導的條件狀語

3、從句中，如果從句談論的是一個有可能發(fā)生的事實及其產生的相關的結果，主句用一般將來時態(tài)，從句用一般現在時態(tài)。C:unless引導的條件狀語從句：unless=ifnotconj.除非若不，除非（否則）.:Let'sgooutforawalkunlessyouaretootired.=Ifyouarenottootied,let'sgooutforawalk.我們出去散步吧，除非是你太累。譯：如果你不早點出發(fā),你就不能及時趕到那兒。我們可以把unless或ifnot從句放在句子開頭或末尾。Youwillbelateforschoolunlessyouleavenow.=Unless

4、youleavenow,youwillbelateforschool.除非你早點出發(fā)，（否則）你上學會遲到。Youwillbelateforschoolifyoudon'tleavenow.=Ifyoudon'tleavenow,youwillbelateforschool.如果你不早點出發(fā)，你上學遲到?！癷f”引導的條件狀語從句的用法,現在總結一下:1)引導條件狀語從句最常用的連詞是if。if引導的條件句有真實條件句和非真實條件句兩種(非真實條件句會在以后的虛擬語氣中闡述)，其引導的真實條件狀語從句表示在某種條件下某事很可能發(fā)生。2)if條件句不一般,幾個要點記心間;條件句,

5、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。【鞏固練習】一. if和unless句型互改。Eg:Youwillfailtheexamifyoudon'tworkhard.=Youwillfailtheexamunlessyouworkhard.1) Unlessyouobeytherules,youwillbepunished.2) Afishdiesifyoudon'tkeepitinthewater.3) NobodycanlearnEnglishwellifhedoesn'tworkhardonit.4) Unlessyou

6、startrightnow,youwillbelateforthemeeting.二. 用if或unless填空。1. youputwoodintowater,itfloats.2. Isleepwiththewindowopenitisreallycold.3. Youwillnotimproveyourskillinashorttime_youpracticeplayingtheviolinregularly.4. Icemeltsyouheatit.5. youboilwater,itbecomessteam（蒸汽）.6. youdon'tworkhard,youwillfail

7、theexam.7. Hecan'tbehereontimehegetsupearly.8. youdon'thaveenoughsleep,youwillfeeltired.9. itisfinetomorrow,Iwillgofishingwithmydad.10. youfinishyourhomework,youwillnotgoouttoplay.三. 單項選擇。1. Youwillnotrememberthefactsyouunderstandthemwell.A.ifB.unlessC.ifnotD.because2. Shenzhenadirtyplaceifw

8、etheground.A.is;litterB.willbe;willlitterC.is;arelitteringD.willbe;litter3. Ifyouharder,youwillfailtheexam.A.notworkB.workC.don'tworkD.won'twork4. youobeytherules,youwillbepunished.A.IfB.SinceC.BecauseD.Unless5.Hecan'tseethewordsontheboardunlesshehisglasses.A.wearB.wearsC.doesn'twear

9、D.towear6.Ifyouplantseedsinsoil,.A.itgrowsB.theygrowC.yougrowD.itwillgrow7. Ifyoucheckyourtimetableeverynight,itinyourmindbetter.A.willstayB.stayC.stayedD.staying8. AtouristwilleasilylosehiswayinBeijinghehasamaporguide.A.ifB,becauseC.unlessD.when9.InoiseshalltelephonethepoliceandcomplainaboutittheA.

10、if,stopsB.unless,stopsC.ifnot,stopsD.unless,stop10. Isleepwiththewindowopenit'sreallycold.A.ifB.ifnotC.unlessD.until11. youtry,youwillneversucceed.A.IfB.UntilC.SinceD.Unless12. hedoesn'tcomeontime,wewillgowithouthim.A.IfB.UnlessC.WhenD.Because13. Iwillcometoseeyouifitraintomorrowmorning.A.won'tB.didn'tC.doesn'tD.don&