1.(口语)=I would
I'd like to stand in if you introduce me.
如果你给我作引见,我愿意加入.
2.(口语)=I had
Well, I think I'd better be leaving now. Goodbye, Caroline.
嗯,我想我最好是现在就离开.卡罗琳,再见.
3.(口语)=I should
You might think, “Hey, for a million dollars I'd do anything.
也许你会问：“喂~一百万诶,我总应该做点什么吧.”