Tung, I'd say 'more clear'.. The basic rule is we use '-r, -er, -ier' for shorter adjectives or adverbs with one or two syllables. 'more' is used for longer adjectives or adverbs and sometimes also for the ones with two syllables.
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Tung QuocDo you say more clear or clearer?What is the rule?clear clearer clearest
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Tung QuocDo you say more clear or clearer?What is the rule?clear clearer clearest
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