UC知道一个英语问题、
来源：百度知道 编辑：UC知道 时间：2024/06/28 09:08:25
The key can't be Peter's.His key is still in the lock.
为什么用can't呢？
不可以用may not 或mustn't 吗？
Is your brother playing computer games ,Ted?
-He can't do that because the computer doesn't work.
Is John coming by train ?
-He should,but he may not. He likes driving his car .
那这两句呢》？
为什么用can't呢？
不可以用may not 或mustn't 吗？
Is your brother playing computer games ,Ted?
-He can't do that because the computer doesn't work.
Is John coming by train ?
-He should,but he may not. He likes driving his car .
那这两句呢》？
这是情态动词表推测的用法。
must.意思是一定，准是。把握性大。用于肯定句。不用于否定句和疑问句。
can 表推测用于否定句和疑问句。把握性大，不用于肯定句。can't意思是不和能，一定不。
may 表推测用于肯定句，可能性比must小。意思是可能，还可用于否定句。意思是可能不。比can't把握性小。不用于疑问句。
情态动词的用法是个难点
【1】must 表猜测只用于肯定句，mustn't 一般表示禁止，但有时也用于回答 May I……？的句型，表示语气强硬
can 表猜测只用于否定句和疑问句
may 表猜测不用与疑问句
另外表猜测否定大多数用can't，表示语气很强烈His key is still in the lock.
说明说话者很肯定
【2】理由同【1】
【3】may 语气比较委婉，表示“也许”He likes driving his car .
说明说话者不太肯定，另外may not多用于回答May I……？的句型
以上是我个人愚见，希望对你有用
不能 can't的意思是 不可能 就是说 这不可能是Peter的
may not 或 mustn't意思不同 may not 是不可以 mustn't 是禁止
意思不同.!~
从意思和程度上去理解和把握，就会不言而喻