改为复数句a radio and a model plane are on改为复数句a radio and a model plane are on the desk

改为复数句a radio and a model plane are on改为复数句a radio and a model plane are on the desk I'm a pupil of Grade Five改为复数句 I'm a pupil.（改为复数句） 怎么改?I'm a pupil.（改为复数句）怎么改? This is a box and that is a knife （改为复数句） There is a book and a pen on the table改为复数句 I have a volleyball and a soccer ball.改为复数句 This is a book 改为复数句 It has a strawberry.改为复数句 This is a pear.改为复数句 He has a strawberry.改为复数句 it is a strawberry 改为复数句 this is a tree 改为复数句 it is a mouse改为复数句 Is this a bus （改为复数句 this is a shirt改为复数句 she is a teacher 改为复数句 It‘s a pear 改为复数句 It is a photo (改为复数句)