415　have been to和have been in

1　have been to+地点名词 表示“去过或到过某地”，而现在已返回，不在那里了，只表示过去的经历，常同once, twice, ever, never, several times等表示次数或时间的副词连用。

Have you ever been to Shanghai? 你到过上海吗？

I have been to the post office. 我到邮局去了。（回答Where have you been?）

2　have been in/at 意为“一直在……，一直待在……”，表示已在某地待了多少时间，指包括现在在内的一段时间，常同for或since引导的短语连用。

I have been in Nanjing for over ten years. 我在南京已经10多年了。

How long have you been in the town? 你在这个小城已经多久了？

He has been in the factory since 2002. 他自2002年以来就一直在这家工厂。

I have been at the village for a long time. 我在这个村子里已经待很长时间了。

I have been to the school for eight years. （误）

I have been in the school for eight years. （正）我到这所学校已经8年了 。

How long have you been to Beijing?（误）

How long have you been in Beijing?（正）你在北京多久了 ?