句子有錯嗎?Have not see you for a long time, how are you doing?

如果你想親密啲，可以這樣寫：
Dear Mary,
Long time no see, how are you?
I am writing to tell you about myself. recently.....................
但如果你想正經，就可以這樣寫：
Dear Mary,
Haven't seen you for a long time, how are you?
I am writing to tell you about myself. recently.....................

您用呢個方式寫，好似係用Present Perfect Tense去寫，但係o係呢道唔應該用Present Perfect Tense，因為咁會有「之前冇見，將來亦冇見」既意思。

所以應該係用Past Tense。

另外，時間是不可數名詞，不應用article。除非用a long period of time。

咁您可以咁寫：

I didn't see you for long time, how are you doing? 或
We didn't meet for long time, how are you doing?

唔可以!應該是:

Dear Mary,
I have not seen you for a long time,what’s everything going on?

文化上用錯左，咁樣會有禮貌!

Haven't not seen you for a long time. How are you?

可以寫成 We have not contact each other for a long time, how's going?