I've never there before. 这句话是错误的。因为里面的have是助动词,表示完成时,而整个句子缺乏动词。正确的句子应该是:I've never been there before. before就是从前的意思,这里是副词用法。例如:The war had ended only a month or so before.战争大约一个月前才刚刚结束。This has never happened before.这在之前从未发生过。