宾语从句三要素一次讲清：陈述语序、引导词that/if/疑问词、时态三口诀主现从随便主过从必过
引言
宾语从句是中考句型题的必考内容，考来考去就三件事：语序、引导词、时态。三要素都记住，这类题就能秒选。
核心概念：宾语从句三要素
```text
要素一：语序——永远是陈述句语序（主语在前，谓语在后）
要素二：引导词——that / if(whether) / 特殊疑问词
要素三：时态——跟着主句走
口诀：时态看主句，语序必陈述，引导词看句意
```
要素一：语序必须是陈述句
```text
不管有没有疑问词，从句都要把主语放前面
他知道你在做什么？
I know what you are doing. ✓（主语 you 在前）
I know what are you doing. ✗（疑问语序，错）
你叫什么名字？
I don't know what your name is. ✓
I don't know what is your name. ✗
```
```text
快速排除法：连接词 + 从句主语
I want to know who the boy is.
→ who + the boy ✓
Could you tell me where the train will leave?
→ where + the train ✓
→ where + will ✗（助动词紧接连接词，是疑问语序）
```
要素二：引导词怎么选
```text
- 陈述句 → that（无含义，可省略）
I know (that) he is honest.
- 一般疑问句 → if / whether（是否）
I wonder whether he will come.
- 特殊疑问句 → 直接用疑问词（what/when/where/why/how）
I wonder when you will come back.
```
要素三：时态三口诀
```text
口诀一：主现从随便
主句是一般现在时，从句按自身需要选择时态
I know he bought a car yesterday.（从句用一般过去时）
口诀二：主过从必过
主句是一般过去时，从句用相应的过去时态
He said he was a teacher.
口诀三：真理永一现
从句是客观真理，无论主句什么时态，从句都用一般现在时
The teacher said the earth goes around the sun.
```
实战练习
```text
- I don't know ______ he will come.（if/whether）
- He said he ______ (be) a teacher. → was
- The teacher told us the earth ______ (go) around the sun. → goes
- I want to know ______ the boy is.（who）
- She asked me ______ I had finished my homework.（if/whether）
```
总结
```text
三要素：语序陈述、引导词看句意、时态看主句
三口诀：主现从随便，主过从必过，真理永一现
做题顺序：先看语序排除，再看引导词，最后看时态
口诀：时态看主句，语序必陈述
```
```text
今日小抄：
I know what you are doing.（陈述语序）
He said he was a teacher.（主过从必过）
The teacher said the earth goes around the sun.（真理用一现）
```