Question

Write a letter to your brother asking him to buy a wrist watch for your examination

Answer 1

Since you are writing a letter to your brother then use informal letter structure/format. It can be used in a casual/friendly language.

Format -

1. Sender's Address on the top left / right
2. leave a line and write the date
3. leave a line and start your greeting by writing "Dear" ,usually which is often used and always correct, and end with a comma after the person's name.
4. The Main Body
5. the Ending - such as " Your lovingly"
6. The Name - your name or signature.

The Main Body

There should be at least 3 paragraphs

1. The first paragraph - the introduction -  you can use sentences like "How are you?" you need to just mention the perpose of why you are writing this letter.
2. The second paragraph - the content - the reason you want a wrist watch for your examination and it will affect upon you. It should have 80 to 100 words.
3. The third paragraph - the conclusion - This is the last paragraph, in this you have to conclude your letter. You can use sentences such as "Please replay soon " or "Give my regards to your Adrian and Anny"