Redaccion de inglésuna carta formal utilizando will y be going to?

Dear Ms.

Finnerty,

Despite doing my utmost to finish the work for the due date, I can see I am rolling behind, and going far to slow.

I am going to try to work faster, however, I am quite sure I will not be able to finish on time.

I would be very grateful if I could have one more day to complete the task.

I can assure that more time will guaranty a better result.

Yours sincerely,

XXXX (aquí pon tu nombre)

Recuerda que cuando sabes el nombre de a quien le escribes, se firma con Yours sincerely, pero cuando le escribes a alguien cuyo nombre no conoces (Dear General manager, por ejemplo) se firma con Yours faithfully.

Espero haberte ayudado.