宾语从句是英语语法中的一个重要主题，它是指作为宾语的从句。宾语从句通常以一个引导词开头，这个引导词是连接主句和从句的桥梁。以下是一些常用的宾语从句引导词。
1. That
“That”是最常见的宾语从句引导词之一，它可以引导一个陈述句或一个命令句作为宾语。例如：
- She said that she loves to read.
- He ordered that she leave the room immediately.
2. Whether/If
“Whether”和“If”都可以引导一个宾语从句来表示两个选项之间的选择。例如：
- I don't know whether/if he will come to the party.
- She asked whether/if I wanted to go with her to the concert.
3. Wh- Words
除了“That”、“Whether”和“If”之外，英语中还有一些以Wh-开头的词可用于引导宾语从句。这些词包括：
- What: 用于询问事物的性质或情况。
- When: 用于询问时间。
- Where: 用于询问地点。
- Who: 用于询问人物。
- Why: 用于询问原因。
例如：
- He asked what I was doing last night.
- I wonder when she will arrive.
- They don't know where he went.
- She asked who the winner was.
- He wanted to know why she was crying.
4. Whether or Not
“Whether or not”可以用于引导一个宾语从句来表示一个问题是否成立。例如：
- He asked whether or not the plane had arrived.
以上是一些常用的宾语从句引导词。掌握这些引导词的用法，能够帮助我们更好地理解和应用英语宾语从句。
