直接引语是选择疑问句时，间接引语必须用连词whether…or引导，不能用if…or引导。

直接引语是反意疑问句时，间接引语可由if或whether引导

He asked: “You have finished your homework, haven’t you?”

He asked me if I had finished my homework.

直接引语是祈使句，变为间接引语由动词不定式表达

直接引语是感叹句，变为间接引语用what/how或that引导

She said, “What a clever boy he is!”

She said that he was a clever boy.

或

She said what a clever boy he was.

直接引语是特殊疑问句，变为间接引语时，就用原来的疑问词引导，不能再加连词that，后面改成陈述句语序。