that引导的宾语从句和if引导的宾语从句怎么用什么时候用that引导的宾语从句和if引导的宾语从句怎么用,什么时候用that,if

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that引导的宾语从句和if引导的宾语从句怎么用什么时候用that引导的宾语从句和if引导的宾语从句怎么用,什么时候用that,if
that引导的宾语从句和if引导的宾语从句怎么用什么时候用
that引导的宾语从句和if引导的宾语从句怎么用,什么时候用that,if

that引导的宾语从句和if引导的宾语从句怎么用什么时候用that引导的宾语从句和if引导的宾语从句怎么用,什么时候用that,if
that引导的宾语从句要用肯定句.
if引导的宾语从句要个一般疑问句.
eg;I know that he must come.
he must come 是一个肯定句.
2.I wonder if he will come.
if he will come.来自于 will he come?
这么说,明白了没有》

先把它的宾语从句变成一个单独句子
1. 该句是一个陈述句,则用that
如: I know that he didn't stay up last night.
He didn't stay up last night.是一个陈述句.
2. 原句是一个一般疑问句/反意疑问句,则用if/whether
如: I want to know... are you ...

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先把它的宾语从句变成一个单独句子
1. 该句是一个陈述句,则用that
如: I know that he didn't stay up last night.
He didn't stay up last night.是一个陈述句.
2. 原句是一个一般疑问句/反意疑问句,则用if/whether
如: I want to know... are you a teacher?
=I want to know if you are a teacher.
I want to know... You are a teacher, aren't you?
=I want to know if you are a teacher.

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