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Which is grammatically correct?:

  • She has become weaker lately.

  • She has become more weak lately.

closed as off-topic by Edwin Ashworth, Nicole, Chenmunka, Hellion, FumbleFingers May 28 '15 at 17:47

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Both are fully grammatical. As with most monosyllabic adjectives, the form weaker is more common, but the more form is always possible.

  • Right. And in some constructions, it's required, e.g, She is more weak than (she is) hungry, I think. – John Lawler May 27 '15 at 18:29

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