作业帮有关情态动词表推测的问题例1：Conserding his ability and experience,he ____ better.A.can have doneB.might have done应该选B,老师说没有can have done,因为can表能力时有时态区别,所以只有could have done,但有can't have
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有关情态动词表推测的问题例1：Conserding his ability and experience,he ____ better.A.can have doneB.might have done应该选B,老师说没有can have done,因为can表能力时有时态区别,所以只有could have done,但有can't have
有关情态动词表推测的问题
例1：Conserding his ability and experience,he ____ better.
A.can have done
B.might have done
应该选B,老师说没有can have done,因为can表能力时有时态区别,所以只有could have done,但有can't have done,这是can表推测,没有时态区别.（说的对吗?）
但这里用might,might不也表推测吗?为什么不能是选A,can表推测?难道can只能做否定推测以及客观推测?
还有,关于should的用法,should也可表推测吧,“他应该是最高的孩子”应该是什么?“He may be the tallest boy.”should can行吗?并请给出解释.
例2.-I can't find my purse.
-You ___ have lost it while shopping.
A.may B.can C.should
其他两个为什么不行呢?
有关情态动词表推测的问题例1：Conserding his ability and experience,he ____ better.A.can have doneB.might have done应该选B,老师说没有can have done,因为can表能力时有时态区别,所以只有could have done,但有can't have
Considering his ability and experience,he ____ better.注：是considering：考虑到、鉴于
选B.might have done.
有题目可知,这里是青苔动词表示对过去的推测,因为can是现在时态,所以错了,改成could就对
can这里错在时态,不是说can不能表示推测,一般can表示推测用于疑问句和否定句.
如 he can't be there.他不可能在那里. can it be true?这可能是真的吗?
故
I can't find my purse.
-You ___ have lost it while shopping.
选A may（可能）,最好改成might
至于should have done为什么不可以呢?
因为它是：本应该做而没有做的意思,表示虚拟猜测
You should have lost it while shopping.：你本应该在逛街时弄丢钱包的.
这个句子在题例中逻辑不通.