This is my cup 改成复数句子怎么改啊

This is my cup 改成复数句子怎么改啊 This is my dress.改成复数句. this is my desk改成复数句 This is my backpack.改成复数形式 Whose toy is this?改成复数句 this is my cup,( )cup is ( ) bule. This is my sister(变为复数句) This is my cousin.(改为复数句) this is my knife改复数句 this is my eraser.改成否定句 this is my ruler改成否定句 this is my ring改成同义句 This is my ball.改成同义句 this is my pen pal改成复数形式 this boy is my goog frierd改成复数形式 This is a sheep怎么改成复数句?急 1.This is my sister.改为复数句2.That is my friend.改为复数句 改成同义句 This is my grandfather and this is my grandmother.___ my ___.