Common sentences for writing letters in English composition

The common sentences for writing English composition defense are as follows:

I am glad to receive your letter.

I'm glad to hear from you.

I received your letter this morning.

I received your letter of June 29th.

You asked me about (questions, questions ...), now let me give you some advice.

You asked me in your letter ... Now, let me give you some advice.

We haven't seen each other for a long time.

How time flies! It has been three months since I last saw you.

How time flies! We haven't seen each other for three months.

I am writing to thank you for your help during my stay in America.

I look forward to hearing from you.

Matters needing attention in writing English letters:

1, with the recipient as the theme. The content of the letter should be relevant to the recipient, at least not to make the recipient feel that it is a mass email.

2. concise and clear. Since the subject is the receiver, don't talk so much nonsense. The greatest respect for the recipient is not to say "thank you for taking the time to read my letter", but to write the letter succinctly and clearly, without wasting the recipient's time at all.