My question is a bit hard to explain, but I was wondering about whether or not there was a rule for how subject and objects should be pluralized. This is the sentence that sparked my curiosity:
... thin strips of metal lined every other tread.
For context, there is a metal strip or bump on every other stair in a staircase. It's just decorative architecture. Anyways, take a look at this second example, which is a rewrite of the first.
... a thin strip of metal lined every other tread.
The meaning is the same, but the subject noun is singular rather than plural. I have looked at other questions, but I cannot understand and apply those answers to this sentence. Pardon my lack of sense, but is there a rule for when the subject and object both need to be plural, and how can I tell which I should use?