he is much thiner than his father 改错

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he is much thiner than his father 改错

he is much thiner than his father 改错
he is much thiner than his father 改错

he is much thiner than his father 改错
he is much thinner than his father (is)
原形容词字尾有「子母子」现象 (即后三个字母和音标的排列是「子母子」)时,则要重覆字尾,再加er
类似的还有sadder,bigger