The writing of English envelopes is different from that of Chinese envelopes. Here are some basic steps and rules:

1. Address of the recipient: Write the address of the recipient in the middle of the envelope. Usually, it is written from small to large, that is, the street name is written first, then the city, province or state, postal code, and finally the country (if it is international mail). Separate each line with a comma.

2. Recipient's name: write the full name of the recipient below the recipient's address. If you are writing to a company or institution, you can write the name of the company or institution.

3. salutation: leave a blank line under the name of the recipient, and then write the salutation of the recipient. If you are writing to an individual, you can use "DearMr./Ms./Mrs.[ surname]"; If you are writing to a company or organization, you can use "DearSir/Madam" or "Dear[ company or organization name]".

4. Body: Leave a blank line under the salutation, and then start writing the body. The text usually begins with "Iamwritingto ..." or "Iamwritinginregardsto ...".

5. Conclusion and signature: Leave a blank line at the bottom of the text, and then write the conclusion and your signature. The conclusion can be "Sincerely", "Yoursfaithfully" and so on, and then write your full name at the bottom of the conclusion.

6. Sender's address: Write the sender's address in the upper left corner of the envelope. This address is for the post office to return the mail to the sender if it cannot be delivered. The sender's address is written the same as the recipient's address.

7. Stamps: Put enough stamps on the upper right corner of the envelope. The amount of stamps needs to be calculated according to the weight and destination of the mail.

The above is the basic way to write an English envelope. I hope it will help you.