我们很久没见面了用英语怎么说

It's a long time since we last met.( 常用）

It's been a while we haven't seen each other.（美国人喜欢用it's been a while.....)

Long time no see.(最口语，最常用，并且滑稽的是，这是chinglish被english借鉴的一句话，最开始由中国人说，然后被流传开来）

We haven't seen each other for long.( 书面语）

我们很久没见了

Long time no see. 这是最简单的说法！

也可以这样说：

We have not met each other for a long time;
或
It is a long time since we met last time.

您所说的“It has been a long time since we met last time”无语

long time no see.

Long time no see 是chinglish，就是中国式英文，不太地道
应该用“I haven't seen you for ages"

long time no see
这种说法是最地道的！