事业单位工龄认定:Is Amy younger than Sam？

Is Amy younger than Sam？ He looks younger than you are? Tom`s younger sister is meter maid The younger generation knows better than their parents? you,Lily,or,younger,is,who (?)连词成句答案 I am younger than you are. 后面为什么跟着个are啊 Is death better than despair ? economics is important than environment? He is cleverer than Tom. Man is greater than he is.