将下列句子变为单数或复数句.It is my watch：__,___my___.They are erasers：__,___,____eraser

They are my watches.
It is an eraser.我再问几道哈~谢谢！！She is my sister：____，____，my_____He is twelve years old：____twelve years old.What is that in English?：____，_____in English？I am a teaher：____are_____Those are apples：____,______appleIs he your father?：___,____your fathersThis is her sister is dictionary：____,_____her sister is _____。They are ID cards.：____is____ID_____。谢谢你拉~She is my sister： They are my sisiters.He is twelve years old：They're twelve years old.What is that in English?： What're those in English？I am a teaher：We are teachers.Those are apples：That's an apple.Is he your father?：Are they your fathersThis is her sister is dictionary： These are her sister is dictionaries.They are ID cards.： Itis an ID card.