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guitar/behind
what's behind the sofa?
lamp/near
There is a guitar behind the sofa.
what's near the sofa?
There is a lamp near the sofa.
clock/on
window/in
There is a clock on the wall.
There is a window in the wall.
(在墙的表面）
（在墙的内部）
in front of
door
There is a chair in front of the door.
chair
what's in front of the door?
Is there a chair in front of the door?
Yes, there is.
A: What's in front of the classroom?
B: There's a tree in front of it.
A: Is there a student in front of the classroom?
B: No, there isn't.
a tree/in front of
the classroom
A: Are there two students in the front of the
classroom?
B: Yes, there are.
A: Is there a teacher in the front of the classroom?
B: No, there isn't.