know 用法

問題：
We have known each other for three years.
這一句還有其他種的說法嗎?


現在完成式比較常用的改法就是前後顛倒:
It has been three years since we knew each other.
我想這是你要的答案.

至於用其他的寫法表達同樣的意思, 當然很多, 不過可能不在討論之列:
It was three years ago when we knew each other.
We knew each other three years ago.

2014-07-19 04:50:49 補充：
'Knew' I suppose.

2014-07-20 11:52:01 補充：
Knowledge Poor, you are right. That sentence I made is not appropriate. Thanks for pointing out.

2014-07-20 11:53:49 補充：
感謝意見指正: We knew each other three years ago. 這句不適合. 因為言下之意就是我們現在不認識了. 所以意思剛好顛倒.

2014-07-20 11:54:34 補充：
感謝意見的指正: We knew each other three years ago. 這句是不適合的, 因為這樣說的話, 言下之意就是我們現在不認識了, 意思剛好顛倒.

We "knew" each other three years ago?

Then we don't know each other now.

...when we came to know each other.

know or knew?

2014-07-19 04:52:38 補充：
Yes. Thanks!

2014-07-20 16:40:09 補充：
That's why present perfect tense is appropriate in this occasion.

It has been 3 years since we know each other.
There has been 3 years from the time we have known each other.
It was 3 years ago when we know each other.