Mary's backpack is on the sofa.(就on the sofa 提问)
Mary's backpack is on the sofa.(就on the sofa 提问)
The book on the sofa is Mary's 提问
The backpack is on the (sofa)对划线部分提问
Her backpack is on the sofa.对划线部分提问(on the sofa)
Thepen is on the sofa对on the sofa提问
The man on the sofa is Peter's brother.(对on the sofa提问)
what\'s on the sofa?
It's on the sofa.
The watch is on the sofa对划线部分提问(on the sofa)
your watch is on the sofa 对 on the sofa 提问
on the sofa还是on sofa对?
on the sofa还是on a sofa