##### 情态助动词 - 情态助动词 `Modal Verbs` - 情态助动词是一类特殊的助动词, 用于表达情态, 能力, 可能性, 意愿, 建议, 命令等含义, 情态助动词不改变形式或时态, 情态动词通常与动词的原形连用, 帮助传达说话人的态度, 观点和意图 - 分类 - can (能够、可以、请求、允许以及可能) - I can swim. (我会游泳) - Can you help me? (你可以帮助我吗) - could (更礼貌的请求, 允许, 建议, 以及可能) - She could play the piano when she was young. (她年轻的时候会弹钢琴) - Could you please pass me the salt? (你可以给我递一下盐吗) - may (可能、可以) - It may rain later. (可能会下雨) - May I ask you a question? (我可以问你一个问题吗) - might (可能、礼貌请求建议) - He thought he might be late. (他认为他可能会迟到) - Might I ask a question? (我能问个问题吗) - should (应该、应当) - You should eat more vegetables. (你应该多吃蔬菜) - Should I apologize to him? (我应该向他道歉吗) - will (将会、愿意) - I will be there on time. (我会准时到那里) - Will you come to the party? (你会来参加聚会吗) - shall (当主语是"I"或“we”时用来代替“will”) - We shall meet at the park. (我们将在公园见面) - Shall I help you with your bags? (我帮你提行李吗) - would (礼貌请求提议，过去的意愿建议等) - He said he would help us. (他说他会帮助我们) - Would you mind sharing a room? (你介意和我共用一个房间吗) - must (必须、一定) - You must finish your homework before you go out. (你必须在外出前完成作业) - Must you leave so soon? Yes, I must. / No, I needn't. (你一定要这么快走吗) - dare (敢) - I daren't (or dare not) try (我不敢尝试) - Dare he do it? (他敢做吗) - need (必须) - You needn't water the grass (你不需要给草浇水) - Need I continue? Yes, you must. / No, you needn't. (我需要继续吗) - ought to (应该、应当) - You ought to apologize for your behavior. (你应该为你的行为道歉) - Ought we to be more worried about the environment? (我们应该更担心环境问题吗) - had better (最好) - I worried for ages and decided that I had better break it to her. (我烦恼了很长时间，后来决定还是把这事告诉她) - Had I better speak to Joan first before I send this form off? What do you think? (在我寄出这份表格之前，我最好先和琼谈谈吗? 你认为怎么样) - have to (必须、一定) - I have to go to hospital for an operation. (我得去医院动手术) - Do we have to take our shoes off? (我们一定要脱鞋吗) - used to (过去习惯行为) - I used to enjoy gardening, but I don't have time for it now. (我过去喜爱园艺，但现在没时间去弄了) - Did you use to work with Kevin Harris? (你以前和凯文 · 哈里斯共事过吗) - be used to (一般习惯) - I work in a hospital, so I’m used to long hours. (我在医院工作，所以我习惯了长时间工作)