WHEN have you been to BEIJING?这句话对吗

WHEN have you been to BEIJING?这句话对吗
WHEN have you been to BEIJING?这句话对吗

WHEN have you been to BEIJING?这句话对吗
如果是问人什么时候去过北京,应该直接问When did you go to Beijing?或者When were you in Beijing?
When have you been to Beijing?这个说法我说不好是对是错,反正我从来没见过

你曾经什么时候去过北京、
have been to:曾经去过某处 是对的、

意思是：你曾经什么时候去过北京？
语法上是没问题的，但有点拗口...
可以改为：When did you go to Beijing?