宾语从句that不省略的情况主要有以下几种：

1.主句后接多个由that引导的从句时，第一个从句的that可省，但后面的that不可省

He said (that) the movie was very funny and that he liked it very much. 

他说，电影很有趣，他很喜欢。

She thought (that) you were very brave and that you deserved the honor. 

她觉得，你非常勇敢，你理应得到这份荣誉。

2.当that从句前有插入语时，that不可省

We hope, on the contrary, that you will realize your dream. 

相反地，我们希望你能实现你的梦想。

I just noticed, for the first time, that Amy was wearing a yellow skirt. 

我刚刚注意到，有史以来第一次，艾米穿着一条黄色的裙子。

3.当有it作形式宾语，而that从句作真正宾语时， that不可省略

I find it necessary that we should begin at once. 

我觉我们有必要马上开始。

She thinks it necessary that you should stay with us. 

她觉得你有必要和我们呆在一块。

4.当that从句是双宾语的直接宾语时，that不可省略

He taught me that family is very important. 

他教导我家庭是非常重要的。

They told me that the tickets had been sold out. 

他们告诉我票已经卖完了。

5.当that从句位于介词except/but之后时，that不可省略

I saw nothing except that she walked as if she were carrying something. 

我什么都没看见，只看见她走路时好像拿着什么东西。

She knew nothing but that you were in bad mood. 

她什么都不知道，只知道你心情不好。

6.仅用that从句回答问题时，that不可省略

--What did you hear?

 你听到什么？

--(I heard) That they wanted to send you away. 

（我听到）他们想把你送走。

7.当that从句移至句首表示强调时，that不可省略

That she is loyal, I don’t believe. 

我不相信她忠诚。

That he is innocent, I know. 

我知道他是无辜的。

以上就是宾语从句that不省略的情况，希望对你有所帮助。