Question

should be doing是什么时态

Answer 1

should be doing ...

这个形式可以看作 是过去将来进行时态 ,

或情态动词表达应该做...的结构形式。如：

You ‘re always out skateboarding when

you should be doing homework.

汉语： 该做作业时 ，你总是跑出去溜滑板 。

Answer 2

回答：两种可能：现在进行时，过去将来进行时。例如：He should be sleeping in the room now.
We told him that we should be climbing the mountain before ten o'clock .