should的用法``

在“ should be doing sth ”或“ should have been doing sth ”等句式中，表示“应该正在……”或表示说话人的某种不满情绪。例如：
Why should we be sitting here doing nothing？ 我们干嘛坐在这里闲着？
You should be wearing a mask. 你应当戴着口罩。
She shouldn't be working like that. She is still so weak.
她不应当那样干。她身体还很虚弱。
You should have been waiting for us. Why haven't you？ 你应当等着我们的。怎么没有等？

shoule 后跟原形

n't be working like that. She is still so weak.
她不应当那样干.她身体还很虚弱.
You should have been waiting for us. Why haven't you? 你应当等着我们的.怎么没有等?

should do/be /be done