比较情态动词must, can/ could, may/ might 用法
1. Surely you can tell an old friend. Could you please explain?
2. It cant be true,Pierre!Cant you borrow some?
3. but you may not remember me. Dont you have a friend who might lend you some?In those days I may have been pretty.
以上这些句子中出现了 must,can/ could,may/ might 的相关用法。现就它们的用法作简要归纳。
一、 must,can/ could,may/ might + 动词原形常用来表示对现在或将来发生情况的推测。
① must 只用于肯定句中,表示一定、肯定。其否定 mustnt 表不准、禁止、不可以等。如:
He never takes a taxi. He must be very poor.
他从不乘出租车,他一定很穷。
I thought you must like something to read,so I have brought you some books.
我想你一定喜欢看点东西,所以我带来了些书。
注意:含有 must be 的反意疑问句,常用 is/are + 主语。含有 must do 的反意疑问句常用 do/ does + 主语。
② can/ could 多用于否定句或疑问句中,偶尔用于肯定句中表示一种可能性。如:
Attending a ball can be exciting.
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