(1) that引导的介词宾语从句

that引导的介词宾语从句仅限于用在except，but，notwithstanding等少数介词后。

His account is correct except that some details are omitted.

除了有些细节未提到外，他的叙述是正确的。

He would have helped us but that he was short of money at the time.

要不是他那时缺钱，他一定会帮助我们的。

(2) 连接代词和连接副词引导的介词宾语从句

I have no definite information yet as to which route he will take.

对他将走哪条路线，我们还没有确切的情报。

I know nothing about the matter except what you told me.

除你告诉我的情况以外，对此事我一无所知。

但要注意：引导介词宾语从句的whether不能换作if。

(3) 名词性关系代词what， whatever， whichever， whoever引导的介词宾语从句

The boy was interested in whatever he saw here

那孩子对在那里看到的任何事物都感兴趣。

The first prize should go to whoever writes best.

头等奖应颁给最优秀的作者。