情态动词语法

《情态动词语法》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、may/might表示允许和可能:允许:询问或说明一件事可不可以做.MayItroubleyouwithaquestion?Youmaytakethisseatifyoulike.Heaskedifhemightglancethroughmyalbum.Youmightaswellspeakyourmind.(比may…显得婉转一些)可能:表示一件事或许发生(或是某种情况可能会存在).Youmaywalktenmileswithoutseeingahouse.Shewasafraidtheymightnotliketheidea.Abadthing

2、mightbeturnedtogoodaccount.might表示请求:MightIaskforaphotographofyourbaby?(比MayI…更客气一些)can’t,couldn’t表示否定的推测:Shecan’tbeserious.Amoresuitablebookcan’tbefound.(Itisnotpossibletofindamoresuitablebook.)Hecouldn’t(can’t)beoverfifty.should,oughtto:表示应该做的事,oughtto比should口气稍重一些.Youshould

3、(oughtto)doashesays.Youshouldn’t(oughtn’tto)talklikethat.但这两者间也有一些差别,在表示责任,义务等该做的事情时,常用oughtto,在表示某件事宜于做时,多用should,在下面的句子中这两个词就不宜换用:Youarehisfather.Yououghttotakecareofhim.Weshouldnotusetoomanybigwordsinoureverydayspeech.will,wouldshall,should表示意愿情态动词后接进行式,完成式和完成进行式:情态动词可以和动词的

4、进行式构成谓语,表示”应该正在…”,“想必正在…”这类意思:Whyshouldwebesittingheredoingnothing?Thisisn’twhatIoughttobedoing.Shemightstillbethinkingaboutthequestionyouraised.Theymust(may)bewaitingforus,let’shurryup.Theycan’tbeusingtheroomnow.情态动词有时和动词的完成形式构成谓语,表示”应当已经…”,“想必已经…”这类意思:Ishouldhavethoughtoftha

5、t.Theyshouldn’thaveleftsosoon.Shemusthavearrivedbynow.Youneedn’thavetoldthemthat.Wherecan(could)hehavegone?Hecan’thavefinishedtheworksosoon.Hemaynothaveachievedallhisaims.Buthiseffortispraise-worthy.Weoughttohavegiveyoumorehelp.情态动词间或也可以和一个动词的完成进行式构成谓语,表示”应当一直在…”,“想必一直在…”这类意思:

6、Theyaresweatingallover.Theymusthavebeenworkinginthefields.Theymayhavebeendiscussingtheproblemthismorning.Youshouldhavebeenwaitingforus.Whyhaven’tyou?Shecouldn’thavebeenswimmingallday.