高中英语 Module 5 Newspapers and Magazines Newspapers and Magazines Grammar and usage课件 外研版必修2.ppt

grammar1adverbialclauseoftime when引导的时间状语从句中的谓语动词既可以是延续性动词 也可以是非延续性动词 从句的动作可以和主句的动作同时发生 也可以先于主语的动作发生 while引导的时间状语从句中的谓语动词一般是一段较长的时间或过程 故动词必须是延续性动词 强调主句谓语动词和从句谓语动词所表示的动作或状态是同时发生或存在的 1 whenheleftschoolatfourteen hebegantotrainasanengineer 2 whilehewastakingawalkinthestreet hesawanaccident 比较句子当中从句与主句谓语动作之间的先后关系 comparethetwosentencesbelow beforehasspecialmeaningsintheadverbialclauseoftime thenegativeformmustn tbeusedinthesuborningsentencesledby before payattentiontothetranslationofthefollowingsentences 1 wehadsailedfourdaysandfournightsbeforewesawland 我们航行了四天四夜才看到陆地 2 wehadn trunamilebeforehefelttired 我们跑了还不到一英里他就累了 3 pleasewriteitdownbeforeyouforgetit 趁你现在没忘把它记下来 4 beforeicouldgetinaword hehadmeasuredme 我还没来得及插话他就给我量好了尺寸 5 itwillbehalfayearbeforeicomeback 半年之后我才能回来 sincecanbeusedintheadverbialclausesoftime muchattentionmustbepaidtothetensesusedinthesentences 1 ihavewrittenhomefourtimessinceicameback 2 itisthreeyearssincethewarbrokeout grammar2adverbialclauseofreason whydidn thecomeyesterday becausehehadsomethingimportanttodo 2 sinceyoudon tliketodoit i llasksomeoneelse readthesentencesbelowcarefully 3 itrainedlastnight forthegroundiswetthismorning 4 nowthatyouhavefinishedyourhomework youmaygohomenow 5 ashewastired hewenttobedearly 1 引导原因状语从句的从属连词有because since for等 because所表示的原因含有很强的因果关系 用来回答why提出的问题 在强调原因时 从句可以置于主句前 whydidn thecomeyesterday becausehehadsomethingimportanttodo 2 for也常用来表示原因 一般用来表示补充说明辅助性理由或提供上文未交代的情况 itrainedlastnight forthegroundiswetthismorning 3 nowthat seeingthat consideringthat等也可以用来引导原因状语从句 有时可以先表示一种情况 再加以推论 that可以省去 nowthatyouhavefinishedyourhomework youmaygohome