The two men pulled out their guns and started shooting at each other.
On the third floor, the office workers could hear the gunfire upstairs.
(the two men are shooting at each other on the 10th floor of the same building as the office workers)
Is upstairs perfectly natural to use here about a floor higher up? Would it require a "from" before it?
Yes, your sentence sounds natural. Upstairs refers to the upper floor or the next level above you in a building. ( =where it came from).
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Yes, your sentence sounds natural.
Upstairs refers to the upper floor or the next level above you in a building.
You can also use from upstairs which indicates or shows the direction of the noise.( =where it came from).
If you refer to a level or floor below then you would use downstairs.
There is ambiguity. In fact, the first time I read it, I thought the office workers were upstairs. Besides, "upstairs" is normally interpreted to mean "on the next floor above", so "from" is no help. Maybe, "The third-floor office wokers could hear the gunfire from where they were seven floors down." But I'm surprised that the reader does not already know what floor the shooting is happening o
anonymousIs "upstairs" perfectly natural to use here about a floor higher up? Yes.
Would it require a "from" before it? No.