I’ve been there.

used to say that one has experienced the same thing that someone else has experienced

某人经历过和其他人一样的事

例：

I know how you feel. I've been there myself.

我懂你，我也曾那样过。

Sue: These employment interviews are very tiring.

这些就业面试真的很累人。

Bob: I know it! I've been there.

我知道，我也经历过。