Should have – for unfulfilled past obligation

Should have:
expressing unfulfilled obligation in the past
should + (not) have + past participle of verb
We use should have to say that someone didn't do something, but it would have been the correct thing to do it. You should have told them the truth.
You shouldn't have gone there – it was a mistake.
I don't think you should have done it.
We often use should have to express regret about the past, or to say that we made a mistake. I’m sorry for shouting at you – I shouldn’t have raised my voice.

test_inter4 Practise this grammar (intermediate level exercise): Should vs. should have

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