you are my teacher改成复数形式

you are my teacher改成复数形式 I am your teacher.能否改成Are you my teacher? YOU are my teacher（改成一般疑问句） This is my backpack.改成复数形式 She is our teacher 这句话怎么样改成复数形式? Are you my English teacher? Is this a book 改成复数形式 Those are chairs 改成单数形式 What are these teacher的复数形式 this boy is my goog frierd改成复数形式 That isn't my CD 改成复数形式 this is my pen pal改成复数形式 eraser改成复数形式