When&While在從句中的用法1.when的用法(1)指時(shí)間點(diǎn)，也可指時(shí)間段，其從句的謂語(yǔ)動(dòng)詞

既可以是延續(xù)性的，也可以是非延續(xù)性的。例句：當(dāng)交通燈是綠色的時(shí)候，你可以過馬路。Youcanwalkacrossthestreetwhentrafficlightsaregreen.(2)引導(dǎo)的從句的謂語(yǔ)動(dòng)作既可與主句謂語(yǔ)動(dòng)作同時(shí)發(fā)

生，也可以是之前或之后發(fā)生。例句：邁克給我打電話時(shí)，我正在跟喬討論一道數(shù)

學(xué)題。IwasdiscussingamathproblemwithJoewhenMikecalledmeup.(3)若主句是一般將來時(shí)，從句用一般現(xiàn)在時(shí)表示將來。例句：我到了上海會(huì)給你打電話。I’llcallyouwhenIarriveinShanghai.2.while的用法(1)指時(shí)間段，其從句的謂語(yǔ)動(dòng)詞必須是延續(xù)性的。例句：請(qǐng)?jiān)谀愕母改附≡诘臅r(shí)候愛他們，不要等到

一切都太遲了。Loveyourparentswhiletheyarealive.Don’twaituntilitistoolate.(2)強(qiáng)調(diào)主句動(dòng)作發(fā)生時(shí)，從句動(dòng)作正在進(jìn)行，常用while引導(dǎo)從句。主句常用一般過去時(shí)或一般現(xiàn)在

時(shí)，從句常用進(jìn)行時(shí)。例句：當(dāng)我正在河邊釣魚時(shí)，我看到附近有一

條空船。WhileIwasfishingbytheriver,Isawanemptyboatnearby.(3)強(qiáng)調(diào)主、從句動(dòng)作同時(shí)進(jìn)行，常用while引導(dǎo)從句，

此時(shí)主從句常用進(jìn)行時(shí)。例句：康康在上音樂課的時(shí)候，Darren在爬山。DarrenwasclimbingamountainwhileKangkangwashavingamusiclesson.過去進(jìn)行時(shí)中的when和while過去進(jìn)行時(shí)還可用于含when或while引導(dǎo)的時(shí)間狀語(yǔ)從句的復(fù)合句中?！?/p>

若when/while引導(dǎo)的從句的動(dòng)作發(fā)生了，主句的動(dòng)作正在進(jìn)行，則從句用一般過去時(shí)，主句用過去進(jìn)行時(shí)。如：

Whentherainstormcame,Iwasreadinginthelibrary.

WhenIwaitedforJim,itwasraininghard.Hewasdrinkingorangejuicewhiletherestofusdrankwater.過去進(jìn)行時(shí)中的when和while①IwaswalkingtoschoolwhenIsawacatinatree.②

WhenSallyarrivedhome,hermotherwascleaningthehouse.主句的動(dòng)作是持續(xù)性的，而從句動(dòng)作是短暫性的，此時(shí)用______引導(dǎo)時(shí)間狀語(yǔ)從句，主句用__________時(shí)態(tài)，從句用一般過去時(shí)態(tài)。過去進(jìn)行when③

WhileIwassleepinginthebedroom,someoneknockedatthedoor.④Davidfellwhile

hewasridinghisbike.主句的動(dòng)作是短暫性的，從句的動(dòng)作是持續(xù)性的，此時(shí)用_______引導(dǎo)從句，主句用__________時(shí)態(tài)，從句用過去進(jìn)行時(shí)態(tài)。一般過去while⑤

WhileAndywaswaitingforthebus,hewasreadinganewspaper.⑥HewascleaninghiscarwhileIwascooking.主句和從句的動(dòng)作在過去的某時(shí)刻或某段時(shí)間同時(shí)發(fā)生,而且動(dòng)作都是持續(xù)性的,此時(shí)用_______引導(dǎo)從句,而且主句和從句都用_________時(shí)態(tài)。過去進(jìn)行while【語(yǔ)境應(yīng)用】完成句子。1)

昨天下午我媽媽在做飯時(shí)，我在洗菜。Whilemymother______________yesterdayafternoon,I_____________________.2)

當(dāng)她看窗外時(shí)，外面正在下大雨。It__________________outsidewhenshelookedoutofthewindow.3)

在上周五Amy生日聚會(huì)時(shí)，她父母正飛向倫敦。AtthetimeofAmy'sbirthdaypartylastFriday,herparents___________________.4)

李老師剛才進(jìn)來時(shí)，我們正在大聲朗讀。WhenMissLi______________justnow,we______________aloud.wascookingwaswashingvegetableswasrainingheavilywereflyingtoLondonwerereadingcameinLookatthetableandwritesentenceswithbothwhileandwhen.JohnMarytakephotosbuyadrinkplaythepianoleavethehousecleanhisroomturnontheradioshoptakethecartothecarwash4a1.WhileJohnwastakingphotos,Maryboughtadrink.JohnwastakingphotoswhenMaryboughtadrink.2.WhileJohnwasplayingthepiano,Maryleftthehouse.JohnwasplayingthepianowhenMaryleftthehouse.JohnMarytakephotosbuyadrinkplaythepianoleavethehousecleanhisroomturnontheradioshoptakethecartothecarwash3.WhileJohnwascleaninghisroom,Maryturnedontheradio.

JohnwascleaninghisroomwhenMaryturnedontheradio.4.WhileJohnwasshopping,Marytookthecartothecarwash.

JohnwasshoppingwhenMarytookthecartothecarwash.Fillintheblankswithwas,were,whenorwhile.At7:00a.m.,Iwokeup.______I____makingmybreakfast,mybrother______listeningtotheradio.________Iwaseating,theradionewstalkedaboutacaraccidentnearourhome.MybrotherandIwentoutrightawaytohavealook._____wegottotheplaceoftheaccident,thecar_____inbadshapefromhittingatree.Butluckily,thedriver____fine.Theroads______icybecauseoftheheavysnowfromthenightbefore.WhilewaswasWhileWhenwaswaswere4bwhen和while用法小結(jié)相同點(diǎn)：

when和while都可以作從屬連詞。

引導(dǎo)時(shí)間狀語(yǔ)從句。

都有“當(dāng)……的時(shí)候”的意思。Lookatthetableandwritesentenceswithbothwhileandwhen.JohnMarytakephotosbuyadrinkplaythepianoleavethehousecleanhisroomturnontheradioshoptakethecartothecarwash4.WhileJohnwasshopping,Marytookthecartothecarwash.

JohnwasshoppingwhenMarytookthecartothecarwash.當(dāng)從句放在前面時(shí)，一般有逗號(hào)與主句隔開。1.WhileJohnwastakingphotos,Maryboughtadrink.JohnwastakingphotoswhenMaryboughtadrink.2.WhileJohnwasplayingthepiano,Maryleftthehouse.JohnwasplayingthepianowhenMaryleftthehouse.3.WhileJohnwascleaninghisroom,Maryturnedontheradio.

JohnwascleaninghisroomwhenMaryturnedontheradio.Can“buyadrink”lastforalongtime?Can“takephotos”continueforsometime?Can“l(fā)eavethehouse”continueforsometime?Can“playthepiano”lastforsometime?Can“sleep”lastforalongtime?No,ithappensonlyonce.Yes,itcanlastforsometime.No,ithappensonlyonce.Yes,youcanplaythepianoforalongtime.Yes,youcansleepeighthours.At7:00a.m.,Iwokeup.______I____makingmybreakfast,mybrother______listeningtotheradio.________Iwaseating,theradionewstalkedaboutacaraccidentnearourhome.MybrotherandIwentoutrightawaytohavealook._____wegottotheplaceoftheaccident,thecar_____inbadsh