我们知道一般情况下that引导的宾语从句是不能放在介词后面的，如果遇到需要在介词后面接that引导的宾语从句我们可以加个形式宾语“it",但是凡事都有例外，有些介词后可直接接“that”宾语从句的。那么，遇到介词后有that从句具体怎么做一起来看看：
一．短语动词中的介词在与“that”引导的宾语从句连用时，需增加形式宾语“it”，位于真实宾语之前。如：
1．You may depend upon it that they will support your plan．你可以相信他们将支持你的计划。
2．He must face up to it that he is no longer young. 他应该勇于正视自己不再年轻这一事实。
二．跟在某些短语动词或某些形容词后的介词，在that从句前常被省略：
I have been very surprised that New York has been so safe. 我因纽约城如此安全而感到惊奇。（surprised后跟的at被略去）
2．She was aware that there were still many problems． 她意识到还存在着许多问题。（aware后跟的of被略去）
三．只有以下六个介词：besides，beyond，but，except，in和save在语言的进化发展过程中，与that构成了一个复合词，起连词作用，that不可省略。其中除了in that外，besides／beyond／but／except／save that都含有“除了”的意思。
1、besides that：此外；除了
She knew nothing besides that he was still alive．除了知道他还活着，她什么也不知道。
2、beyond that：除去，除……而外
Have you heard anything beyond that he is ill?
除知他病了之外，你还听到别的情况吗？
3、but that：要不是；如非，除…外
Nothing would satisfy that child but that I place her on my lap. 那孩子什么都不要，只要我把她抱在膝上。
Nothing would please him but that you bring him a gift．
除了你给他带件礼物外，什么都不会使他开心。
4、except that：除去…之外；只可惜；除去，除掉
This restaurant has nothing to recommend except that it's cheap.
这家饭馆除了价钱便宜之外，一无可取。
It's a very satisfactory coat，except that it doesn't fit me．那是一顶件很令人满意的外套，只可惜穿着不合适。
5、save that：（不常用）除了……以外
I know nothing about him save that he comes from Sichuan.
我对他一无所知，除了他来自四川。
There was not a sound save that from time to time a bird called．除了偶然两声鸟叫外，一点声音也没有。
6、in that：[书面语]既然，因为；在……方面
One can make great achievement in that he does but not he knows.
人生伟业的建立，不在能知，乃在能行。
Men differ from brutes in that they can think and speak．人和动物的区别在于人能思维，人有语言。
