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-Isn't that Ann's husband over here?—No,it can't be him.I'm

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-Isn't that Ann's husband over here?—No,it can't be him.I'm sure he doesn't wear glasses.
此句中的can't为情态动词表推测,为什么后面不用完成时?
-Isn't that Ann's husband over here?—No,it can't be him.I'm
如果用了完成时,表示对过去的推测,而这道题目,明显是现在不可能是他,是现在的推测,所以,就没必要用完成时
再问: 谢谢哈,请教个问题,情态动词表对现在的推测用情态动词加v原型,对过去的推测加现在完成时,那对将来的推测加什么呢?谢谢!
再答: 用虚拟语气,would could might加动原