"in a corner" and "at a corner"?

[Liuxin3562]

Hello,
Would you please tell me about the difference between "in a corner" and "at a corner"?
Thanks!
Helena

[Cerberus™]

Perhaps you could give us an example of the type of sentence you were thinking of? In general, you could say that "in" is used when you are on the inside of a corner. Take this wall, for instance:
_________________
| ________________
||
|| (house/room)
||
||
||
||
|| A =in the corner
||________________
|_________________
B =at the corner
(street)

You could say that A is in the corner of the room in the house; B is at the corner of the house. But "at" is a bit more general: you could say that it just means you are somewhere near the corner. To be "in" a corner really means that you are in a way 'surrounded' by the corner. Then there is "on the corner", which means something like "at the corner". You will often see "on" and "at" used to describe something that is at the place where two crossing streets meet.