人教八下Unit5when和while的用法和區(qū)別（共16張）

時間狀語從句中when和while的用法及區(qū)別課程內(nèi)容：

課程目標1.時間狀語從句中when的含義及用法2.時間狀語從句中while的含義及用法3.when和while的用法區(qū)分（重點）

導入你能找出句子中的狀語么？Shestudieshardintheuniversityeveryday.Shestudieshardintheuniversityeveryday.

導入狀語——謂語動詞的狀態(tài)，包括時間、地點、原因、狀態(tài)、目的、結(jié)果、方式、程度等。

導入Shestudieshardintheuniversityeveryday.時間狀語時間狀語從句Shestudieshardwhenshewasintheuniversity.主句

從句

When表示”當…時候”。主句用過去進行時。從句中既可以用延續(xù)性動詞,又可以用非延續(xù)性動詞,這些動詞既可以表示動作,又可以表示狀態(tài)。從句中的動作既可和主句動作同時發(fā)生,又可在主句動作之前或之后發(fā)生。tH:MarywashavingdinnerwhenIsawherTheboywasstillsleepingwhenhismothergothomeyesterdayevening知識卡片一：whenMarywasstudyingwhenIsawher.John

was

sleeping

whenhismothergothomeyesterdayevening.Maryboughtagift

WhenJohnwastakingphotos.含義when為“當...的時候”多用一般過去時也可用過去進行時when引導時間狀語從句用法-Mom，I'mhungryI'dlikesomethingtoeat．-Oh，dear．Here'ssomebread.A.such；thatB.so；that例題講解1.Mr.Greenwastalkingonthephone___Iarrivedathisoffice.

A.whenB.afterC.whereA-Mom，I'mhungryI'dlikesomethingtoeat．-Oh，dear．Here'ssomebread.A.such；thatB.so；that知識卡片二:whileMr.Johnson

calledme

whileIwasdoingmyhomework.TheweatherwasfinewhileweweretravellinginBeijing.含義While表示“在....時候”、“在…期間”。Theweatherwasfinewhilewe

travelledinBeijing.While引導的時間狀語從句用法從句多用進行時不可用一般過去時-Mom，I'mhungryI'dlikesomethingtoeat．-Oh，dear．Here'ssomebread.A.such；thatB.so；that例題講解1.Tedfelloffhisbicyclewhilehe______itandhurthimself.A.wasridingB.rodeC.wereridingD.rideA

綜合練習1.Hewasabouttogotobed________thedoorbellrang.

A.whileB.beforeC.when

2._______JohnwaswatchingTV,hiswifewascooking.A.AfterC.WhileC.Until3.Hereachedtheschoolgate________thebellrang.A.whileB.whenC.since-Mom，I'mhungryI'dlikesomethingtoeat．-Oh，dear．Here'ssomebread.A.such；thatB.so；that知識卡片三：區(qū)別主從句時態(tài)角度觀察下列句子并總結(jié)whenwhile用法：1.Itwasrainingheavilywhen

wearrived.2.Theboyfellasleep

when/whileIwasreading.3.Iwasdoinghomeworkwhilemymotherwascooking.時態(tài)區(qū)分

應用練習whenVSwhile1._________Iarrivedhome,motherwascooking.2._________shewastalking,hersisterwalkedin.2._________Ifoundmydog,itwasplayingwithanotherdog.4._________Iwasdancing,hewassingingloudly.Summary1When可指時間點,又可指時間段,從句中可用延續(xù)性動詞,也可用非延續(xù)性動詞。2While總是指一個時間段,從句中必須用延續(xù)性動詞。3統(tǒng)一時態(tài):主句過去式,從句也是過去式一、動詞角度1.When=duringthetimeoratthetime從句中可用延續(xù)性動詞,也可用非延續(xù)性動詞；2.While=duringthetime，從句中必須用延續(xù)性動詞。when和while拓展區(qū)分注：能夠區(qū)分延續(xù)性和非延續(xù)性動詞的學生補充Summary1When可指時間點,又可指時間段,從句中可用延續(xù)性動詞,也可用非延續(xù)性動詞。2While總是指一個時間段,從句中必須用延續(xù)性動詞。3統(tǒng)一時態(tài):主句過去式,從句也是過去式二、主從句動作關系角度when和while拓展區(qū)分1.Itwasrainingheavilywhen

wearrived.2.Theboyfellasleep

when/whileIwasreading.3.Iwasdoinghomew