情态动词+虚拟语气复习课程
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情态动词情态动词++虚拟语气•Eric情态动词是一类比较特殊的词汇,它本身没有固定的词义,需要和另外一个动词一起才能构成谓语,用来表示说话者的态度、语气等。
除ought需要跟动词不定式外,其余情态动词后跟动词原形。
情态动词没有人称和数的变化。
must>will≥would>ought to≥should>can>could>may≥might可能性顺序:可能性顺序:must>can的用法1.表示能力(能做某事)Can you ride a bicycle?I can"t promise anything,but I will do what I can.be able to可以表示相同意思,并还可以明确表示未来时间,甚至用于完成时Our baby will be able to walk in a few weeks.Since his accident he has not been able to walk properly.2.客观可能性(可以,可能做某事)I can call you tomorrow.I"m afraid I can"t go with you.3.有时会(不经常如此)Scotland can be very cold.It can be quite windy on the hill.4.可能,表示诧异,怀疑,不相信(多用于否定、疑问或感叹句)That can"t be Mary-she"s in hospital.Can he still be alive after all these years.后面有时跟完成时和进行时She can"t be telling the truth.她讲的不可能是真话He can"t have taken it upstairs.他不可能把它拿上楼了5.表示允许(和may的意思相近,口语can用的多)You can park here.You can"t smoke here.could的用法1.作为can的过去式,表示过去的情况a.表示能力I could see her through the window.也可用was/were able toHe said he had lost his passport and hadn"t been able to leave the country.b.表示可能性(比can的可能性小)I thought I could smell something burning.单击此处添加标题2.用来代替can,说明现在情况:a.婉转的提出请求、想法、建议等:Could you send me an application form?申请表You could have a nursery here.b.用于疑问及否定句,表示惊异,不相信Could this be true?这能是真的么?3.用于虚拟条件句You could get into university if you applied. If you tried you could do that work.4.could+完成时,用来表示过去的情况:a.表示“那时(不)可能”Don"t worry-they could have just forgotten to phone.She could not have been more than6then.他那时不可能超过6岁。