Question

it has been a long time since we last wrote to each other.什么意思

Answer 1

　　翻译：自从上次我们互相写信以来有很长时间了。（意思就是很长时间没有互相通信了）
　　分析：这是一个复合句，由主句加since引导的时间状语从句组成。
　　It（主语） has been（谓语） a long time（表语） since （连词引导时间状语从句）we（状语从句主语） last（时间状语） wrote（状语从句谓语） to each other（方向状语）.
　　当since后面句子的谓语动词是延续性的，表示这件事情结束有多久了；since引导的从句用过去式，而主句用现在完成时。
　　It is a long time since we last wrote to each other.

　　词组：
　　write to+sb：给某人写信
　　a long time：很长的一段时间
　　例如：
　　It has been three years since he smoked.
　　他不吸烟已有3年了。
　　He has been quite well since he smoked.
　　他戒烟以来身体一直很好。
　　I haven't written to her since she lived in Beijing.
　　自从她离开北京以来，我一直没有给她写信。

Answer 2

it has been a long time since we last wrote to each other.
我们已经很长时间了，因为我们最后一次写信给对方。
it has been a long time since we last wrote to each other.
我们已经很长时间了，因为我们最后一次写信给对方。

Answer 3

自从我们上次写信给对方以后，已经过了很久了。