is dave your pen friend?

is dave your pen friend? Where --------- your pen friend-------? This is _____（definite) a letter from your pen-friend Were is your pen friend from?(变为同义句） Is ___your pen friend? Is this your pen? That is your pen that is your pen. Who can be your pen friend? My pen is {broken} ｛ ｝｛ ｝with your pen? This not is your pen,your pen is white.改错 Is this a your pen?