can't be+v must be+v怎样表示,过去式呢,过去完成的呢?
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解决时间 2021-02-14 18:11
- 提问者网友：ミ烙印ゝ
- 2021-02-14 01:04
can't be+v must be+v怎样表示,过去式呢,过去完成的呢?
最佳答案
- 五星知识达人网友：雾月
- 2021-02-14 01:19
couldn't be 不可能不能够couldn't have been 过去不可能做过如I couldn't have said that .我不可能说过那样的话must be 一定(Somebody is knocking at the door.It must be Tom有人在 敲门,一定是Tom)must have been过去一定做过(It must have been rained last night,beacuse the ground is wet.昨晚一定下雨了因为地面湿了)======以下答案可供参考======供参考答案1:过去式couldn't be must be过去完成时couldn't have been must have been供参考答案2:couldn't be couldn't have been must be must have been
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- 1楼网友：毛毛
- 2021-02-14 02:13
我学会了
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