Should have done... 本应该……
1. She shouldn't have gone sightseeing.
2. We should have gone swimming, but it rained.
3. We should have offered our help to him.
A: You should have been at home and enjoyed a big meal.
B: Yes. I should have gone to buy the ticket in advance. But now...
A: But now you can stay with friends and enjoy a holiday too.
B: Right. Let's go and find some fun.