Correct: frighten, lengthen, civilise, energise, diversify, forbidden, sweeten, apologise, visualise, classify, simplify, analyse, harmonise, dampen, summarise, idolise, capitalise, beautify, straighten, purify, symbolise, memorise, falsify, mistaken, Incorrect: frightan, lengthern, civilyse, energyse, diversen, forbidify, sweetenise, apologyes, visualify, classifen, simplise, analise, harmonys, dampise, summaryes, idolify, capitalen, beautifise,

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