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We know from this sentence that Samand is inside the house.
"Samand is at the house."
We cannot tell from this sentence if Samand is inside the house or outside the house but we know he is somewhere at the house.
Today I was at the office. If someone phoned at my home asking where I was they would have been told "Robyn is at the office."
While I was there if someone was looking for me, they would have asked where is Robyn? For most of the day the response would have been; "She is in her office."
I have a room in a building that is my office, however during the day I move to and from my room to interact throughout the building, the whole place where I work can be refered to as "the office" in which case you would say 'at' but when I am actually within my office you would say 'in'.
Are you more confused now?
I think I am.
Right now I am sitting at my desc infront of my computer in my office at home.
If a speaker is some miles away, he could say She's in/at the office.
SilversamandIn general, we see "in" as being contained by borders, wall, limits, a period, etc. (both literal and metaphoric). With "at" we generally imagine a point in space or time.
Then we have fixed expressions like:
at the office
at (the) school
People are waiting to help.
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