so=the meaning "you want some more cake "
如果你还要蛋糕的话,请告诉我
but his doctor refused to do so（so指代前面出现的做法）.
但他的医生拒绝这么做so, i so thankyou said so. 我用的没错吧？！so的几个意思.So, thank you for saying so (to me).第一个so表示结果，第二个so是指示代词那么，谢谢你（告诉我）这些。