間接疑問句（Indirect Questions ）是指直接引語是疑問句，變成間接引語。
1. 間接一般疑問句的疑問部分主語和動詞不需要倒裝.另外,疑問部分由if 或whether與主句連線,如:
直接一般疑問句:Is it raining ？
間接一般疑問句:He asked if (whether) it was raining.
注意: whether 可與or not 連用,表示一種選擇.而if 則不可.如:
He wants to know whether or not we want dinner.
2. 間接特殊疑問句
間接特殊疑問句由特殊疑問詞將主語與問句連線起來. 如:
(a) 直接特殊疑問句: Why do you come so late ？
間接特殊疑問句:Mary wanted to know why she came so late.
(b) 直接特殊疑問句:Where are going ？
間接特殊疑問句:He asked me where I was going.
注意: 當疑問詞做賓語時,間接疑問句的語序不變,如:
(a) 直接疑問句:Who did you see yesterday ？
間接疑問句:Please tell me whom you saw yesterday.
(b) 直接疑問句:Which room do you prefer ？
間接疑問句:He wanted to know which I prefered the room.
