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1、sad 比较级是sadder 。因为sad是单音节单词,所以不需要变成more sad 或者most sad的形式。
2、adj. 难过的;悲哀的,令人悲痛的;凄惨的,阴郁的(形容颜色)。
3、[例句]Once I had a little dog who used to look at me with sad eyes when I coughed: he was the only living creature I have ever loved.我要告诉你一个笑话:从前我有一只小狗,当我咳嗽的,它总是用悲哀的瞅着我,它是我唯一喜爱过的动物。