为什么是“Can you tell me when he bought the car"而不是"Can you tell me when did he buy the car"

问题描述:

为什么是“Can you tell me when he bought the car"而不是"Can you tell me when did he buy the car"

一个问句中不能有两个问句。从句是陈述句。

是宾语从句,要用陈述语句