UC知道couldn't 和 shouldn't
来源：百度知道 编辑：UC知道 时间：2024/05/01 15:09:36
4.He__ the 8:20 bus because he didn't leave home till 8:25.
A couldn't have caught B ought to have caught C shouldn't have caught D must not have caught
为什么选C,A哪里不妥,谢谢!
问题补充：那为什么
She must be in the dormitory now.
No, she __ be there. I saw her in the classroom a minute ago.
A mustn't B can't C couldn't D wouldn't可以选B呢?是不是如果有shouldn't的话答案就是shouldn't了呢?
A couldn't have caught B ought to have caught C shouldn't have caught D must not have caught
为什么选C,A哪里不妥,谢谢!
问题补充：那为什么
She must be in the dormitory now.
No, she __ be there. I saw her in the classroom a minute ago.
A mustn't B can't C couldn't D wouldn't可以选B呢?是不是如果有shouldn't的话答案就是shouldn't了呢?
问题补充的那个考的是可能性的问题
must太绝对
问题的 shouldn't have caught 在这里有委婉责备的特定用法,更符合情景
She must be in the dormitory now.
No, she __ be there. I saw her in the classroom a minute ago.
A mustn't B can't C couldn't D wouldn't
这里只能选B
表示推断，如果是肯定的话。我们可以用must,may, might, 等。肯定的语气依次减弱，但如果是否定的就只用cannot。
mustn't不是表推断，而是表禁止。
wouldn't shouldn't是“不应该”的意思，也不表推断。
第一题有些奇怪。你确认题目是这样吗？
should not have done sth 是做了不应该作的事情。
You should not have called other people so late.
你不应该这么晚给人打电话。言下之意是说你已经打了。
should not have done sth 是做了不应该作的事情。/对过去所发生事情的推测 should 作为情态动词表是有根据的估计/推测:按理应该. couldn't have done 不可能 太绝了,情态动词一定要注意语气强烈与否,d语法没问题
第一个因为后面是原因，前面就应该是推理出来的结果，所以说应该是，答案C。
can't否定中最强的推测,must表推测不用于否定句中
不知你明白吗?
第一个因为后面是原因，前面就应该是推理出来的结果，所以说应该是，而不用不可能是。
1.他要乘8:20的车，因为他出门在8：25之前