There is a couch in the room.
Câu phủ định :
There isn't a couch in the room.
Câu nghi vấn :
Is there a couch in the room ?
PĐ:
There isn't doi a couch in the room.
NV:
Is there a couch in the room?
*Phủ định:
=> There isn't a couch in the room.
*Nghi vấn:
=> Is there a couch in the room?