英语语法-名词从句
概念：三种 句子充当另外一句子的四种句子成分
1. 陈述句：句前 + that (当宾语时可省略)
a. That the moon itself does not give off lights is common knowledge.
b. I’ve learned (that) love, not time heals all wounds.
2. 一般疑问：变陈述句语序，句前 + whether(当宾语时可用if)
a. My question is whether people will live on the moon someday.
b. I don’t know if/whether he needs my help.
3. 特殊疑问：变陈述句语序
a. Money is what we are badly in need of.
| 句子类型 | 引导词 | 从句中作用 |
|---|---|---|
| 陈述句 | that | 不做成分 |
| 一般疑问 | whether, if | 不做成分 |
| 特殊疑问 | 连接副词when, where, why, how连接代词who, whom, what; which, whose | 连接副词做状语who, whom, what做主语/表语/宾语which, whose做定语,后+名词连用 |
it形式主语：it在句首，主句在后面
a. It is common knowledge that the moon itself does not give off light.
b. It is not known where they came from.
it形式宾语：复合宾语中：动词 + it + 宾补 + 宾语从句
I find it encouraging how many young women are pursuing careers in
science.
**双宾语：**Could you tell me where the post office is?
介词后做宾语： You should vote for which candidate you assume best.
形容词后做宾语： I am afraid that I can’t come.
并列宾语从句中that不省略： I once read that “” and that “”.
reason后的表语从句：引导词用that，不用because.
The reason (why) he was dismissed is that he was careless and irresponsible.
**嵌套：**a. I realized that what I said was not exactly what I meant to say.
b. The question is how what you have learned can be put into practice.
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