I wonder where they have gone这里为什么用have.然后那个gone是过去分词么

I wonder where they have gone这里为什么用have.然后那个gone是过去分词么 i don't know where they have gone 《飘》的翻译是Gone with the wind,这里为什么要用go的过去分词gone where have they gone?答语急呀 I wish I____to Shanghai last month 为什么可以用would have gone?和过去 have you always gone to this school?为什么这里要用always gone to? Where have all the young girls gone?Where did they all gone? Where have you gone 意思 I have no idea where the girl could have gone to.为什么不可以+to? Cause i have gone 是什么时态?为什么 I have gone to Guangzhou.对Guangzhou 提问,Where have you gone?为 Where have you ____?I have ____ Beijing .A gone,gone to B be