英语中that引导什么从句
that可以引导名词性从句、定语从句。that引导名词性从句时（即主语、宾语、表语、同位语从句），在从句中无具体含义，只起连接作用，而且在从句中也不作任何句子成分；
that引导的主语从句，表语从句以及同位语中，that不能省略；
that引导的宾语从句，一般可以省去that，但在下面情况中不能省略。
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。