精选优质文档-倾情为你奉上必修3 语法Unit 1& Unit 2 Modal verbs情态动词(讲解详见P9194)1. 情态动词的语法特征:1) 情态动词不能单独做谓语, 除ought和have外, 后面只能接不带to的不定式。 2) 情态动词没有人称, 数的变化, 但有些情态动词, 如can, will也有一般式和过去式的变化。3）只作情态动词的: can / could, may / might, ought to, must可情态可实义的: need, dare 可情态可助动词的: shall / should, will /would相当于情态动词的: have to, used to2. 情态动词：can & could, may & might, will & would, shall & should, must/ can, ought to & ought not to, have to & dont have to, mustnt & neednt等注意事项：1. can 和 could
