Puzzling Plurals: Stairs
Upstairs and downstairs have an -s ending, but they actually refer to one location: another floor of the building. If stairs, upstairs, or downstairs is the subject, the verb should agree with a singular noun.
- The upstairs has a home theater. (upstairs in this example is the subject – have agrees with upstairs)
- Upstairs, there is a home theater. (upstairs in this example refers to the location only – it’s not the subject here)
If the word stair appears first in a compound word, it will not take an -s.
- staircase, stairwell
If there is just one stair, call it a step (not a stair). If there is one or a few steps, use the:
- up the step(s), down the step(s), up the stairs, down the stairs
- These expressions imply movement rather than location.
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