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Which one is correct and more appropriate?

two years’ period

two years period


marked as duplicate by Damkerng T., ColleenV, M.A.R., StoneyB, Maulik V Mar 7 '16 at 7:34

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It should be

a two-year period

"Two-year" is functioning as an adjective in this case, but adjectives don't have plural forms in English.

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