n you understand the different kinds of English these people are using? Two years later, he was able to speak very good Chinese. 2) could 的主要用法是: A. could 是 can 的过去式, 表示与过去有关的能力和推测: e.g. We all knew that the young man couldn ’ t be a doctor. B. could 可以代替 can 表示请求, 但语气较 can 客气、委婉: e.g. Could you lend me your dictionary? Could I use your bike? 3) can 和 could 接动词的完成形式,表示可能已经做某事。 can 用在否定和疑问句中, 表示不相信、怀疑等态度。 e.g. They can't have gone out because the light is still on. 以 could 或 would 提问时,不能再以 could 或 would 作答,而应该用 can 或 will 。如: — Could I borrow your dictionary? — Yes, of course you can . may 和 might : may 常用来表示: A. 表示请求、允许; 比 can 较为正式: e.g. May e in ? You may go now. B. 表示说话人的猜测: “也许”“可能”: 通常只用于肯定句和否定句中。
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