1.He should have studied for the test yesterday.
He shouldn't have come to school without studying.
2.I should have put the cup of tea aside while I was working on the computer.
I shouldn't have spilt tea on the computer last night.
3.You should have e-mailed him while you were on holiday.
You shouldn't have forgotten about him when you were on holiday.
4.You should've tidied your room last night.
You shouldn't have left your room messy last night.
