have been to和have been in的区别主要体现在以下三个方面：
指代不同：have been to表示“到过”；have been in表示“一直都在”。
语法和侧重点不同：have been to表示“过去到过而现在已返回”，它强调“最近的经历”，侧重于表达一个曾经发生过的状态；have been in表示“在某地待了一段时间”，常接时间段，它强调过去的经历，但没有说明现在是否已回来，侧重于表达一个持续的状态。
具体用法不同：当have been to后面接副词，如接here，there，home等时，to要省略；而have been in+组织，也可以表示加入某组织。
一、have been To
have been to主要用来表示我们去过某地，但人已经回来，离开之前所去的地方了（We use have been to to say that we went somewhere and came back and that we are not there anymore.）。
如：
I have been to Paris before, and I can tell you that it’s an amazing city. (“我”已回来)
My brother has been to Venice. I am sure he can give us some advice about where to eat or where to stay. (“我兄弟”去过威尼斯，但人已经回来)
【注意】
当后接副词时，have been to中的介词to要省略。
如：
正确：I have never been abroad.
错误：I have never been to abroad.
二、have been In
have been in主要用来表示我们在某地已经呆了多长时间（We use have been in to give information about how long we have been somewhere.）。
如：
A: How long have you been in California?
B: I have been in San Francisco for six years and never thought of going back to my homeland.
再比如说，如果我们要表达某人离开上海去北京了，然后我们告诉别人，这个人已经去北京，并且在那儿呆了三天了，用英语表达为：
She has been in Beijing for three days.
此时不能用have been to，因为她还没回到上海。但是，这种情况下可以用have gone to，即：
She has gone to Beijing.