En inglés 'Should have' se utiliza en los siguientes casos:
1. Cuando hablamos de eventos pasados que no sucedieron.
- 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.
2. Cuando reflexionamos sobre eventos que pueden o no haber sucedido.
- 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.
3. Utilizamos 'should not have' cuando reflexionamos negativamente sobre lo que puede o no suceder.
- 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.
4. Utilizamos 'should not have' en inglés también cuando expresamos arrepentimiento por acciones pasadas.
- 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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