that引导什么从句充当成分

　　1、that在引导定语从句时是关系代词在从句中起代词作用代替先行词可以在定从中充当主语宾语等句子成分，充当宾语时that可以省略。

　　2、在限制性定语从句中that有时也可以充当关系副词作定从中作状语，这种用法的that也可以省略。

　　3、that在引导名词性从句时是连接词仅起连接作用不能在从句中充当句子成分本身也没有意思，that在引导宾语从句时可以省略。

　　例句：

　　She of all people should know the answer to that.

　　在所有的人中，唯有她最应知道那个问题的答案。

　　I'd like to come on to that question later.

　　我想以后再讨论那个问题。

　　That is no way to treat another human being.

　　那绝不是对待他人的方式。

　　Had I known that I would never have come.

　　要是早知道，我绝不会来的。

　　Keep going like that ─ you're doing fine.

　　就这样做下去——你做得蛮不错嘛。

　　We had to work within the parameters that had already been established.

　　我们必须在已设定的范围内工作。

　　You could see from his face that he was lying.

　　从他的表情上你可以看出他在说假话。

　　She's a changed woman since she got that job.

　　她自从得到了那份工作，变得判若两人。