he has gone跟he had gone 有什么区别?

he has gone跟he had gone 有什么区别? he is gone和he has gone什么区别 He has gone to Beijing和He had gone to Beijing有什么不同? He had already gone & He has already gone has been to he has gone 有什么区别? 例题： Tonm ,can you tell me whe He is gone.和 He has gone.在状态上有什么不同? where has he gone “Gone,he has He has gone. has/had been 跟has/had gone had gone和have gone有什么区别啊``急 请问where has he gone和where he has gone分别用在什么情况?