when did he buy the car 和when he bought the car 怎么区别在哪

问题描述:

when did he buy the car 和when he bought the car 怎么区别在哪

前一句是单独的疑问句。
后一句是从句,一般表时间状语从句

when did he buy the car -----------------------独立的特殊疑问句
when he bought the car------------------------复合句中的宾从

When did he buy the car:他什么时候买的车?
When he bought the car:他买车的时候
When he bought the car,what happened?他买车的时候,发生了什么事?
When did he buy the car?I never thought he would get a red one.他什么时候买的车啊?没想到他会选红的.

when did he buy the car
是问句,有助动词 did
他什么时候买的这辆车?
when he bought the car
陈述句,常作从句
当他买这辆车的时候.