1 情态动词主要用法总结 can / could 1. 表能力： 例：Can you type? She could run and was a good player. 2. 表允许, “可以”。 例：Can I come in? He said we could go to the shop for sweets. could 比 can 语气更委婉。也可以用 “may”. 3. 表猜测，多用于疑问或否定句。 例：Can it be true? He can’t be more than thirty. Where could he have gone? 4. 虚拟语气中用could. 例：If you tried, you could do that work. 5. 表一时的情况, “有时候会… ..” 例：Children can be very annoying. Our house is on the top of the hill, and in winter the winds can be very cold. may / might 1. 表许可或征求同意, “可以”。 2 例：May / Might I leave? You may bring them back tomorrow. 2. 表可能性, “可能，或许”。 例：He may not be there. He thought it might be wise to try his luck there. You may/might have read some account of the matter. 3. 虚拟语气中用might. 例：If you didn’t mind, we might go there. If it had not been for you, I might not have understood. 4. may 表祝愿。 例：May you be happy! May God bless you! mu st 1. “必须，一定要”。 例：You must see the doctor. 2. 表猜测，“一定… ..”。 例：Judging by the smell, the food must be good. He must have arrived by air. He must be working hard. 3. 表客观必然、不可避免, “必然会，肯定会”. 例：All men must die. 4. 表说话人的不耐烦或令人不快的事，“偏要，偏偏”。 3 例：Just when we were ready to go away for the holidays, the baby must catch a cold. shall 助动词用法：构成将来时，用于第一人称。 例：We shall read about this tomorrow. （也可以用will 表示） 情态动词用法： 1．征求对方意见，用于一、三人称的疑问句。 例：Shall I turn on the light? Shall the boy wait? 2. 表示说话人的许诺、威胁、决心、规定、命令等，“一定要….”. 例：I shall be there. I promise you shall see her again. Each com...
