状语从句时态问题As I was coming here,I met your brother.那这句话有没错呢?

状语从句时态问题
As I was coming here,I met your brother.那这句话有没错呢?

应该是as i came here ,i met your brother
as 或when 引导的是一个时间节点,而不是一个正在发生的动作.我们可以说,
when i came here ,he was talking with his brother/ he was watching TV.
一般不说,when i was coming here ,或者as i was coming here