在英语语法中，名词性从句中的连接词that可以在特定情况下省略，包括主句动词是感官动词或使役动词时，主句中有形容词修饰名词时，以及主句中有“the +形容词最高级”时。使用时需确保句子表达清晰、准确。
1. 当主句动词是感官动词或使役动词时
感官动词如see、hear、feel等，使役动词如make、let、help等，它们后面的名词性从句中的that可以省略。
例如：
- I heard (that) he was coming.
- He made me (that) he was sorry.
2. 当主句中有形容词修饰名词时
当主句中有形容词修饰名词时，名词性从句中的that可以省略。
例如：
- It is important (that) you study hard.
- The fact (that) he didn't come surprised me.
3. 当主句中有“the +形容词最高级”时
当主句中有“the +形容词最高级”时，名词性从句中的that可以省略。
例如：
- This is (the) best news (that) I have heard all day.
- That was (the) worst movie (that) I have ever seen.
