Hermione opened her door with a curious look . " Harry , what are you doing here ? " " I came to give you the rest of your birthday gift . " She smiled . " The rest of it ?

Question: What must have Harry done with the gift prior to this ?
Answer: Harry must have forgotten to give Hermione her gift .Harry must have given Hermione the whole gift .Harry must have forgotten to buy Hermione a gift .Harry must have given Hermione a part of her gift earlier .