1. One of the best things about life is that we never have to stop learning.
表语从句
从句：
主宾从句——不可以去掉的从句
主语从句、宾语从句、表语从句
从句不是整句（少主语或宾语）：缺物、事情用what , 缺人 用who
从句是整句: 翻译不缺意义，用that； 缺少意义， 用相应的意义词，比如缺为什么用why
the hotel is different from what it used to be.
that he knew the fact was amazing.
