Do you know where does he come from?哪错了Do you know where he comes from.如果用be from 转换的话 Do you know where he is from?

问题描述:

Do you know where does he come from?哪错了
Do you know where he comes from.
如果用be from 转换的话 Do you know where he is from?

Do you know where he comes from?是对的, 前面已经是个疑问句式了do you know,后面就用陈述句的语序.
你的理解是对的