whose is this pen? - this is my pen.
whose is this book? - this is your book.
whose is this table? - this is my brother's table.
whose is this bag? - this is my mom's bag.
whose is this pencil? - this is my sister's pencil.
is this your notebook? - yes, it is.
is this your brother's notebook? - no, this is my notebook.
where is your table? - he is in the middle of the room.
where is your pen? - she is in my pocket.
where is your notebook? - it is on the table.
where is your mom? - she is at work.
where is your brother? - he is at school.