Can some one tell me how to write a cover letter?

Answer 1

Keep it short and to the point. Basically three paragraphs. In the first state what position you are applying for and how you found out about it. In the second state the reasons you think that you are qualified for the position. In the last refer to your resume and any other items you are sending them andrequest action on their part; a prompt response from them and close the letter.

Answer 2

a lot sample online. Check it here

http://www.career.vt.edu/JOBSEARC/coversamples.htm