Write a letter to your friend asking him to return your book.
15, Defence Colony,
New Delhi.
January 30, 1993
My dear Hamid,
You will please recall that, about a month back, you had borrowed my Grammar book for a few days. I am sure, you must have made use of the book and taken necessary notes from it. As my examinations are approaching, I also require the Grammar book for study. I shall indeed be grateful if you please return the book to me, at your earliest convenience.
Please convey my regards to your parents and love to your younger brother and sister
With good wishes,
Yours sincerely,
Kewal