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在英语语法中，主语从句是由连接词“that”引导的一个从句，用来作为主句的主语。但是，有时候我们可以省略掉这个“that”，使句子更加简洁明了。那么，什么时候可以省略主语从句中的“that”呢？
1. 在口语中
在口语中，为了使句子更加流畅自然，我们可以省略主语从句中的“that”。例如：
- I think [that] he should apologize. -> I think he should apologize.
- She said [that] she would come to the party. -> She said she would come to the party.
2. 在非正式的写作中
在非正式的写作中，为了让文章更加通俗易懂，我们也可以省略主语从句中的“that”。例如：
- The fact [that] he failed the exam surprised everyone. -> The fact he failed the exam surprised everyone.
- The idea [that] we should have a party sounds great. -> The idea we should have a party sounds great.
3. 在某些情况下
在某些情况下，主语从句中的“that”可以省略，但这不是必须的。例如：
- It is important [that] you arrive on time. -> It is important you arrive on time.
- The doctor suggested [that] I should take some medicine. -> The doctor suggested I should take some medicine.
总之，省略主语从句中的“that”不是一定要这么做，但在口语和非正式的写作中，这种做法可以让句子更加简洁明了。
