if引导的宾语从句有几种？
if引导宾语从句的例句如下：
1、My mother asked me if I wanted anything to drink.
我妈妈问我是否要喝点什么。
2、He didn't know if he was right.
他不知道他是否正确。
3、I asked her if she was happy.
我问她是否她是开心的。
if引导宾语从句的用法
表示“是否”：此时用来引导宾语从句，if引导宾语从句时不能作介词宾语宾语从句要用陈述句语序。有时if可以和whether互换。
例句：She asked me if/whether I liked swimming.
她问我是否喜欢游泳。
if引导宾语从句时，要注意三个方面，即连词、语序和时态。
例如：我不知道他今天是否会来。
[误]I don’t know that if(whether)he will come here today.
[正]I don’t know if(whether)he will come here today.
if引导的宾语从句应和主句的时态保持一致。即主句为一般现在时，从句用任一种时态。主句为一般过去时，从句则用过去时中的任一种时态。
例句：I don’t know if(whether)he has come here.
我不知道他是否来过这儿。
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