It是形式主语时如何确定真正的主语It is sad that many people do not want to help others because they do not want any trouble.这里的It是形式主语，那么真正的主语是指哪一部分呢，包括because从句嘛？

在句子“It is sad that many people do not want to help others because they do not want any trouble”中，真正的主语是“that many people do not want to help others”，不包括because从句。以下是详细解释：

1. 形式主语与真正主语的区分

在英语中，当主语从句较长或结构复杂时，为了避免句子头重脚轻，常用“it”作形式主语，而将真正的主语置于句尾。

在句子“It is sad that many people do not want to help others because they do not want any trouble”中，“It”就是形式主语，用于引导整个句子，并使其结构更加平衡。

2. 真正主语的确定

真正的主语是位于“It is sad”之后的“that”引导的从句，即“that many people do not want to help others”。

这个从句是句子表达的核心内容，说明了“It is sad”的原因。

3. Because从句的作用

“because they do not want any trouble”是一个原因状语从句，用于解释“many people do not want to help others”的原因。

它并不是句子的真正主语，而是对真正主语“that many people do not want to help others”的进一步说明和补充。

在句子“It is sad that many people do not want to help others because they do not want any trouble”中，真正的主语是“that many people do not want to help others”，而不包括because从句。

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