情态动词有四类：

①只做情态动词：must,can(could),may(might),ought to

②可做情态动词又可做实义动词：need,dare

③可做情态动词又可做助动词：shall(should),will(would)

④有情态动词特征：have(had) to,used to

希望【视拓英语】为你提供的这些情态动词对你有所帮助