Calla Lily
I'm writing to you or I'm writing you?

Hello there, 
When I write a letter to someone at beginning of paragraph.

Should I use A or B, which expression is the formal sentence?

A I am writing you about your letter
B I am writing to you about your letter

Thank you,

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التعليقات · 3
3

In British English, 'to' would never be omitted in that sentence. Only sentence B is correct in BrE.

In American English, both are correct. Whether one is more formal I don't know, although I'd guess the omission of 'to' would make it less formal.

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1
Paul is correct about these sentences in American English.  His guess is also correct. :)
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I am writing to you about the letter you sent me last week.  
I wrote a letter to James that he might come to my house next week to in order to finalize the settlement. 
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