should,must,can, may, shall, could, might的用法答:(1)表示对现在和将来状况的推测:must 一定,may 可能,might 也许,can’t 不可能。(2)对已经过去的情况的推测,用“情态动词+have+ done”结构:①must have done 过去一定已经…(只用于肯定句中)②can’t / couldn’t have done 过去不可能--- (表示否定)③may/might have done 可能已经--- ④needn’t...
should,would,could,must,might,may,can有什么区别答:---Well, I must have been sleeping, so I didn't hear it.5) 否定推测用can't。If Tom didn't leave here until five o'clock, he can't be home yet. 如果汤姆五点才离开这儿,他此时一定还未到家。5 表示推测的用法 can, could, may, might, must 皆可表示推测,其用法如下:1...