Hey,Sally.
Yes?
Is my computer game on the table?
No,it isn't. It's on the bookcase.
Oh,ok.How about my books? Are they on the bookcase, too?
No,they aren't. They're on the chair.
Oh.So.Where's my pencil case?
It's under the sofa,
And where's my backpack?
It's under thr table . And your basebll is under the chair.
Oh,ok.And where are Mom's keys?
The keys?They're on the table.
把上面这段话中的复数形式的句子改成单数形式的句子
单数形式的句子改成复数形式的句子..