must+have done 句型
来源:百度知道 编辑:UC知道 时间:2024/05/17 21:50:05
must+have done 表对过去发生事情有把握推测.
但是可不可以用must +be 这样的句子来表示?
比如说 He must have made it for you. 可以变成 He must be made it for you 吗?
另外 疑问否定中的can't/couldn't have done .什么时候用can't ?什么时候用couldn't ?
但是可不可以用must +be 这样的句子来表示?
比如说 He must have made it for you. 可以变成 He must be made it for you 吗?
另外 疑问否定中的can't/couldn't have done .什么时候用can't ?什么时候用couldn't ?
不能用must be done的形式。因为must have done强调的是动作已经完成。
can't和couldn't是可以通用的,但是后者的语气较委婉。
不可以,must have done是固定形式,不能转换
coudn't在虚拟情况下使用,can't在一般情况下
不可以。
must be 这样用:
Oh.It must be Tom who loves Lily.
这样的推测。
或者:It must be yours.
1 不可以。must be 是对现在的推测了。
2 通用。任意换
不行,这样变成被动语态。变成他被做成了它..
must+have done 句型
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有没有must not have done的说法呀~~
have done
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must have done 表推测时,附加疑问句该怎么样用?
have been done和 have done
have done and have been done