must be doing是对现在进行推测,那对将来呢/?
问题描述：
must be doing是对现在进行推测,那对将来呢/?
答
must be 对将来
must have done 对过去
答
must be doing表示对现在的状态猜测.
He must be reading.他一定现在在看书.
对将来的猜测 will be doing.