the chair is( )the desk.

the chair is( )the desk.
the chair is( )the desk.

the chair is( )the desk.
behind（在...后面）,near（在...旁边）两个都行吧

under
。。

near

on/under/near都可以

next to

next to 凳子在桌子旁，强调是紧挨关系

【near】