1.have been to,表示“曾经去过某地（已回来）”
我举个例子吧,I have been to England.我曾经去过英格兰（已经回来了）
2.have been in,表示“已经……（持续的）”
再举个例子,Lately i have been in need of money.我最近缺钱用.
3.have gone to,表示“已经去某地（还未回来）”
例子,They have gone to Beijing.他们已经去北京了.（还未回来）