精选优质文档-倾情为你奉上精讲点拨1. 情态动词can, may和must情态动词和不带to的动词不定式一起构成谓语，但ought除外。情态动词有一定的词义，没有人称和数的变化。它表示说话人的语气或情态，如请求、命令、愿望、能力以及可能性等。情态动词含义示例一般疑问句回答can/could能；能够；会；可以We can buy a car to save our time on the road.Can he swim?Yes,can./ No,cant.许可You can(=may) go home now. /用于条件句中If he comes, he can help us.I could come earlier, if necessary./be able to与can同义，常用以表示can所不能表示的将来或完成时的概念She will be able to buy the house by the end of next year.Yes,is(are).
