【英语语法】(情态动词虚拟语气、定语从句、强调句分词作状语)课件.pptVIP

英语语法讲解;;动态中把握英语语法;英语句子五个层次的变化;;;;;;情态动词的完成时(表示对过去的说法);can’t(couldn’t)+have+过去分词（用于否定或疑问句）不可能……..

HecannothavebeentothattownforIsawhimjustnow.

;should/oughtto+have+过去分词本应该做(却没有做)…….

Ashisbestfriend,youshould/oughttohavehelpedhim.(butinfact,youdidn’t.);shouldn’t/oughtnotto+have+过去分词本不应该做(却做了)…….

Youshouldn’thaveparkedyourcarhere,forit’sapublicplace.

;needn’t+have+过去分词

本不必做……

Youneedn’thavewaitedforme.ItoldyouyesterdayIwouldoverwork.;虚拟语气的用法;虚拟语气用于条件状语从句;与现在事实相反

If+did(be→were)，…would(should,could,might)+do

Ifhehadtime,hewouldattendthemeeting.

IfIwereyou,IshouldstudyEnglish.;与将来事实相反

If+did(be—were)/wereto/should+do,…would(should,could,might)+do

Ifyoucametomorrow,wewouldhavethemeeting.

Ifitweretoraintomorrow,themeetingwouldbeputoff.;虚拟语气用于宾语从句

在表示建议、要求、命令类的动词后面的宾语从句中用(should)+do。

如:advise,suggest,propose,request,require,insist,demand,order,command,desire

Wesuggestedthatwe(should)haveameeting.

Weinsistedthatthemeeting(should)becancelled.;注意：suggest作“暗示，表明”解时，insist作“坚决认为”解时不用虚拟语气，而用一般的时态。

Mikeinsistedthathehadneverstolenanything.

Hersun-tannedfacesuggestedthatshewasinexcellenthealth.;虚拟语气用于主语从句

Itisnecessary(important,natural,strange,essential,etc.)thatsb(should)+动词原形

Thisisaverydifficultoperation.Itisessentialthatyoubepreparedforemergency.;;虚拟语气用于表语从句、同位语从句

作advice,idea,order,demand,plan,proposal,suggestion,request，wish等名词的表语从句、同位语从句。其谓语动词用(should)+动词原形

Weallagreedtohissuggestionthatwe(should)gotoBeijingforsightseeing.;itis(high)timesb+did

Itis(high)timeweleft.;虚拟语气用于ifonly引导的感叹句中(要是…就好了)

IfonlyIhadtakenhisadvice.;定语从句;who（代替人）:

Iknowthemanwho/thatisstandingunderthetreeoverthere.

whom:

Thedoctor(whom)youarelookingforisintheroom.

Whostandsneartheriverisourschool.;whose（可代替人和物）

Doyouknowthe