情态动词是英语中的一类特殊动词，用于表示说话人对某种行为或状态的看法、意愿、推测等情态。以下是情态动词的分类：
- 只做情态动词：may, might, must…
- We may go to the movies after dinner. (我们可能会在晚餐后去看电影。)
- He might have already arrived at the airport. (他可能已经到了机场。)
- You must follow the steps in the manual to complete this task.(你必须按照说明书上的步骤操作才能完成这项任务。)
- 可做情态动词又可做实义动词：need, dare等。例如：
- Need:
- 作情态动词: You need to finish your homework before you can go out. (你必须在出门前完成作业。)
- 作实义动词: I need some help with this project. (我需要一些关于这个项目的帮助。)
- Dare:
- 作情态动词: How dare you speak to me like that? (你怎么敢这样跟我说话？)
- 作实义动词: I wouldn’t dare to do that. (我不敢那样做。)
- Need:
- 具有情态动词特征：have(had,has) to, used to, ought to等。例如：
- Have to: You have to wear a mask in public places. (你必须在公共场所戴口罩。)
- Used to: I used to live in New York. (我曾经住在纽约。)
- Ought to: You ought to apologize for what you said. (你应该为你说的话道歉。)
- 可做情态动词又可作助动词：shall(should), will(would)等。例如：
- Shall/Should:
- 作情态动词: Shall we go for a walk? (我们去散步好吗？)
- 作助动词: We were told that we should sight the Treasure lsland that night. (我们被告知那天夜里我们就要看见宝岛了。)
- Will/Would:
- 作情态动词: Would you like some tea? (你想喝点茶吗？)
- 作助动词: He said that he would always remember that day. (他说他将永远记住那一天。)
- Shall/Should: