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情态动词ShecanspeakFrenchandIcan’t. 什么叫情态动词?表示说话人对所述动作的看法,如需要、可能、意愿或怀疑等情感或状态情态动词的特征HecanspeakEnglishwellbutIcan’t.Wemuststayhere.情态动词有词义,不能单独做谓语,无人称和数的变化,后面必须接动词原形can/could/beableto
1.三个都表“能力”could是can的过去式eg:Icouldn’tspeakEnglish.IcanspeakEnglishnow.将来能力使用shall/will/beableto.eg:IwillbeabletospeakFrench.
2.can/could表“请求、允许”could比can更委婉eg:CouldIborrowyourbook
3.can/could表“怀疑、推测”可能性can‘tbeeg:Itcan’tbeLily’sbag.may/might
1.表“请求、许可”might比may更委婉、客气eg:MayIcomeinMightIcomein
2.“可能”,表推测可能性maybemightbeeg:Hemaycometomorrow.Hemightcometomorrow.必须must/haveto不得不
1.must表个人意志和主观上的必要,意为“必须”“应该”用于一般现在时;Imustgonow.
2.haveto表客观上的必要意为“必须”“不得不”除可用于现在时外,还可以表将来时shall/willhaveto和过去式hadto
1.这台电视机不能用了,我们必须买台新的ThisTVdoesn’twork.Wehavetobuyanewone.
2.那时我们必须买台新的Wehadtobuyanewone.
3.我们将不得不买台新的Wewillhavetobuyanewone.ImuststudyhardbecauseIwanttogotoBeijingUniversity.Ihavetogoshoppingbecausethefridgeisemptynow.should/would/oughtto应该愿意理所应当
1.Youarehismotheryououghttolookafterhim.
2.Youareastudentyoushouldstudyhard.
3.Shewouldbegladifyouwouldhelpher.情态动词表推测mustbemaybemightbecan’tbedareneed既可作情态动词,又可作行为动词做情态动词,无人称、数变化,主要用于否定句和疑问句情态动词类型
1.只作情态动词的有mustcancouldmaymight
2.可作情态动词也可作实义动词的有need,dare
3.可作情态动词也可作助动词的有willwould.shallshould
4.具有情态动词的某些特征的有havetooughtto。