Dear Mr and Mrs Harris,
Welcome to our neighborhood.You must be excited to be in a new house.However,would you mind not dropping the litters anywhere?For it is bad for our environment.And could you please turn down the music?I can't fall asleep because of the loud music.Besides,would you mind not letting your children play football in the house?For it is very noisy and dangerous.In this way,I'm sure that we can get along well with each other.
Yours sincerely
Bob