Question

Suppose you have lost your library cart. Now write a letter to the librarian of your school requesting him/her to issue a fuplicate library card in your favour

Answer 1

I don't need to suppose.

Answer 2

                                                                                             X Y Z
                                                                                             Suryasen tower,
                                                                                             A- wing, 15th flour,
                                                                                             1501, Goregaon
                                                                                              4000605

respected,
(name of your librarian)
                                       Subject:- requesting librarian to issue a duplicate                                                            library card.


                               respected (librarian's name), i m xyz a student or member of you library. I m sending u this letter bcz i hve lost my library card somewhere. i wanted a book frm library for some referance and for that i need a library card which i hve lost. i kindly request u to plz arrange or issue a duplicate library card for me bcz it is very important. 
kindly do so.
                                 sorry for the disturbance.
                                                                                              your's sincere
                                                                                                     xyz