been
pp of be. been, NOTE ON USAGE 用法
Been is used as the past participle of both `be' and `go' *been用作`be'和`go'两字的过去分词
I've never been seriously ill (be). 我从未得过大病（动词原形为 be）.
I've never been to London (go). 我从未去过伦敦（动词原形为 go）. Gone is also a past participle of `go' *gone也是`go'的过去分词
They've been to the cinema means that they went and have returned. ｀他们去过电影院＇意思是他们去了而且已回来了. They've gone to the cinema means that they went and are not back yet. ｀他们去电影院了＇意思是他们去了但是还没回来.