We can use 'should have' to talk about past events that did not happen
I should have let her know what was happening but I forgot
He should have sent everybody a reminder by email
They should have remembered that their guests
don't eat pork
We can also use 'should have' to speculate about events that may or may not have happened
She should have got the letter this morning. I expect she'll give us a call about it later
He should have arrived at his office by now. Let's try ringing him
They should have all read that first email by this stage. It's time to send the next one
We can use ' should not have' to
speculate negatively about what may or may not have happened
She shouldn't have left work yet. I'll call
her office
He shouldn't have boarded his plane yet. We can probably still get hold of him
They shouldn't have sent the report off for printing yet. There is still time to make changes
We can also use 'should not have' to regret past actions
I shouldn't have shouted at you. I
apologise
We shouldn't have left the office so late.
We should have anticipated this bad traffic
They shouldn't have sacked him. He was
the most creative person on their team
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