文档介绍：3、引导连词：that, whether, if, as if。
有词义，在从句中担任成分，如主语、表语、宾语、或定语等。
有词义，在从句中担任成分，作状语。
that 无词义，在从句中不担任成分，有时可省略；if (whether), as if虽有词义，但在从句中不担任成分。
1、连接代词：who, whose, whom, what, which
2、连接副词：when, where, why, how
宾语从句三要素
1. Martin never learnt who he was.
2. The police asked whose car was stolen.
3. I don't know whom the vaze belongs to.
4. She did not know what had happened.
5. --- could you do me a favor?
--- It depends on what it is.
6. I don't know which country he comes from.
1、连接代词：who, whose, whom, what, which
2、连接副词：when, where, why, how
Can you tell me when the train leaves?
He told me where Lu Xun once lived.
Do you know why she got up so early this morning?
He told us how they won the match.
3、连接词：that, whether, if,
1. He told us that he felt ill.
2. Everybody could see what happened and that Tom was frightened.
3. I doubt whether he will succeed.
4. I don’t know if/(whether)you can help me.
（1）that 可以省略
（2）if与whether可互换
（3）作介词宾语时一般用whether
宾语从句的语序用陈述语序：
连接词+主语+谓语+其他成分
特殊疑问句：
Who is he?
陈述句：
He is a student.
一般疑问句：
Is he a student?
我不知道他是谁
我问他是否是个学生。
他说他是个学生。
陈述句作宾语引导词用__________无词义，可以省略.
that he is a student
1. He says _________________.
that
2. I ask him __________________________
whether (if) he is a student.
一般疑问句作宾语，引导词有词义,“是否”，不作句子成分.
whether 或if
3. I don’t know _____________
who he is.
特殊疑问句作宾语，引导词用______________，必须作句子成分
特殊疑问词