1.  HOW CAN YOU WRITE WE WRITE FORMAL LETTER
2. WHAT IS IT FORMAT 
3. CAN YOU GIVE US SOME QUESTION TO WRITE FORMAL LETTER 

Here is a sample letter for your reference:

Q. Write a letter to the editor of newspaper highlighting the pollution in the different rivers of India.
[[S]]

Amrita Hazra

B-17, East of Kailash,

New Delhi-65

To,

The Editor

“Delhi Daily”

Park Street,

New Delhi-20.

Date: 07 July, 2012

Sir,

Subject: Pollution as a threat to the rivers of our nation.

This is to bring to your notice that the pollutants from different industries in towns and cities are posing a serious threat to the rivers of our nation. The water has become unsuitable for drinking purposes. The water is not even suitable for growing crops as it is filled with harmful chemicals which are not at all good for the crops. Water pollution also arouses so many various kinds of diseases from the contamination. These also might turn to spread an epidemic.

You are requested to please bring this issue into limelight so that more people could be made aware of all this. Hope to receive a positive response from you.

Thanking you in anticipation,

Yours faithfully,

Amrita Hazra.