Adding "s" to a noun makes it plural; that is, it makes it refer to more than one person or thing. So "centre" refers to one centre, and "centres" refers to more than one centre. The same applies to "venue" (one) and "venues" (more than one).
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MUETThe addition of "s" to a noun means something different from the addition of "s" to a verb.
You're correct. Actually I don't differentiate