1. Address: Write "Dear Classmate" or "Dear Classmate" at the beginning of the letter to show goodwill and concern. Expressing concern: In the letter, you can express your concern about your classmates' study, life and health. You can ask them about their study in school, their friends and their participation in extracurricular activities, and encourage them to face the challenges in their study and life positively.

2. Encourage learning: In the letter, students can be encouraged to study hard and pursue Excellence. You can share some successful learning methods and experiences to encourage students to overcome difficulties and strive for better grades. Convey values: in the letter, you can convey some positive values, such as diligence, self-discipline, unity and friendship. You can quote some famous sayings or stories to support these values.

3. Thank the teachers: In the letter, you can thank the teachers for their efforts and contributions to the growth and education of students. Conclusion: At the end of the letter, you can once again express your concern and support for your classmates and encourage them to continue their efforts to realize their dreams. At the same time, we should also express our expectations and blessings for the future.

Matters needing attention about the letter writing format are as follows:

1. Heading: At the beginning of the letter, write the address and name of the recipient and the address and name of the writer. This will let the recipient know who wrote the letter and how to reply.

2. Address: At the beginning of the letter, use an appropriate address to show respect and courtesy to the recipient. For example, if the recipient is a friend or family member, you can use a friendly address; If the recipient is a stranger or a stranger, you can use a more formal title.

3. Text: In the text of the letter, the main contents of the letter should be clearly expressed. If segmentation is needed, it should be distinguished by appropriate paragraphs and titles. At the same time, we should pay attention to express our meaning in simple and clear language, and avoid using too complicated or obscure vocabulary or grammatical structure.

4. Ending: At the end of the letter, you can emphasize the main meaning again or express your thanks, and end the letter in polite language. Signature: at the end of the letter, use your signature and date to show that you are responsible for the contents of the letter and confirm the validity of the letter.

5. Attachment: If you need to attach documents or photos, you should indicate them in the letter and send them together in an envelope. Mailing: When mailing a letter, you should choose the appropriate mailing method and postage to ensure that the letter can reach the recipient in time and accurately.