"Please talk quietly in the library."
Imperative because it gives a command or request.
Hope I was able to help! :)
from address
.....
To address
....
Date- ....
Subject- Request to borrow book
dear ....
i wanted to request you if i could borrow your book called .... . my friends told me that it is a very interesting book. I know that you love the book but i so badly want to read it. I request you to lend me the book. i promise you that i will keep it in perfect condition. i would be very thankful if u lent me the book.
Yours sincerely,
....
One good option is tetrameter.
