The English composition format for writing letters is as follows:

1. letterhead: includes basic information, such as the name, address and telephone number of the sender.

2. Address in the letter: including the name, address, telephone number and other basic information of the recipient.

3. Address: Use the appropriate address according to the relationship with the recipient.

4. Text: The main content of the letter.

5. Conclusion: Use appropriate conclusion according to the relationship with the recipient and the content of the letter.

6. Signature and date: the sender's signature.