He has bought the car since that day不改变时态

问题描述:

He has bought the car since that day
不改变时态

He bought the car that day

He has had the car since that day.

He has had the car since that day.
强调过去一直延续到现在的状态.因为buy是瞬间动词不能用完成时态(因为不能一直处于“买”这个动作)所以改为had.