The teacher should have told her students before asking questions. It's OK, but seems missing what the teacher told the students. The teacher should have told her students to raise their hands before asking questions.
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Puja WahiThe teacher should have taught the chapter before asking questions from it.Perfectly OK.
Puja WahiActually I don't know whether I can use 'should have+ third form of verb' in non conditional sentences or not.can, could, will, would, shall, should, may, might, and must are always used with the first form of the verb.
Puja WahiWhat is the actual meaning of 'should have taught',' should have shifted' etc.In conditional sentences I know how to use them. But what are their exact meanings in non - conditional sentences?The meaning of 'should have' is fairly stable. It usually includes the meaning of 'would have ..., but didn't' and the meaning of 'wise' or 'a good idea', like