精选优质文档-倾情为你奉上高一英语情态动词专题训练概 说助动词(auxiliary)主要有两类：基本助动词(primary auxiliary)和情态助动词(modal auxiliary)。基本助动词有三个：do, have和be；情态助动词有十三个：may, might; can, could; will, would; shall, should; must, need, dare, used to, ought to. 上述两类助动词的共同特征是，在协助主动词构成限定动词词组时，具有作用词的功能：1） 构成否定式：He didnt go and neither did she.The meeting might not start until 5 oclock.2） 构成疑问式或附加疑问式：Must you leave right now?You have been learning French for 5 years, havent you?3） 构成修辞倒装：Nowhere can he obtain any i
