he lived in china when he was born 为什么不用since

问题描述:

he lived in china when he was born 为什么不用since

如果用since ,前面的主句就要用现在完成时

he lived in china when he was born
因为都是过去式.
注意下面的区别::
He has been living in china since he was born
他从出生,一直住在中国.