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1.have done sth.已经做了某事
Now you've broken his vase.
2.I'm awfully sorry我很抱歉
Tom,I'm awfully sorry.
3.should have done sth.本该做了某事
I should have put that vase away.
4.don't need to do sth.没必要做某事
You don't need to do that.
5.I have…我有……
I have an excuse to buy a new one.