why= what for for 表示原因 比如 the stage was set up for a concert the hall 大厅里的舞台是为了一场音乐会而被搭建的 对concert 提问 就是 what was the stage set up for in the hall 就等于 why did they set up the stage in the hall
1. why = for what “为什么”。 2. 然后把原句的主动语态变成被动语态即可得出该句答案,被动语态中的by sb(them)经常可以省略,注意此句为一般过去时。 即:Why did they set up the stage in the hall? = (What) was the stage set up (for) in the hall (by them)?