The format of the letter, preferably detailed.

1, "Dear:" or "Dear:" (capitalized, don't forget the colon).

2. (Empty box 2) Say hello to each other first. If you greet your elders, say, "Hello!" ; The words of peers are "Hello!" Familiar words: "Long time no see!" Something like that

3, the text has something to say, nothing to shoot the breeze, anyway, write with you, the beginning of each paragraph should be empty.

4. Ending format: "This is a salute (write a few spaces)" (write another line in the top box).

5. Author's signature (right) and writing date (right).