when 后应接具体动作,用于一般现在时、一般过去时、一般将来时等.如 when did you arrive there?
而 “have … been”则问过程、状态,是完成时的标志.如：
Have you ever been there?
How long have you been in the town?
这句话错将两种时态用词“when ”“have been”混用了.