Amy said:
When do I need to use 'at'?
Why musn't i use 'at' in this sentence?
I put some towels at the bathroom.
Why is this sentence correct?
I put some towels in the bathroom.
Use "in" for enclosed areas or for spaces with limitations.
A bathroom is an enclosed area, so we say "in the bathroom".
space with a limitation - They're in the water. (at the beach) We might consider that the ocean is not an enclosed area, but a space with a limitation.
The satellite is in outerspace. - Once again, "outer space" is not an enclosed area, but it does have limitations.
Use "at" for locations. I bought some paper towels at the store to put in the bathroom.
Where's Joe? He's at the store. - The speaker and listener can't see the store. They are relatively far away from it.
Where's Joe? He's in the store. - The speaker and listener can see the store. They are most likely in the parking lot of the store or very close to the store.