The noun 'reason' is a singular noun as a word for a cause, explanation, or justification for something; an argument or premise that supports a belief or conclusion.
The plural noun is 'reasons'.
The noun 'reason' is an uncountable (mass) noun as a word for the ability of the mind to think, understand, or form logical conclusions; common sense; sanity.
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Addendum is singular. Addenda or addendums is plural.
Analysis is the singular, analyses is the plural.
The noun 'sharpener' is singular, a word for one.The plural noun is 'sharpeners'.
Verbs cannot be singular or plural. Requires is after singular nouns.
shift from plural to singular or singular to plural in sentence