...problems to settle 中为什么to settle不用to be settled?答:楼主好以下我帮你整理了一下不定式的主动形式表示被动 2.在"n/pron + be + adj + to do"结构中.常用的形容词有easy,difficult,hard,impossible,nice,pleasant,light,heavy,interesting,important,expensive,cheap, fit, dangerous等.例如:He is hard to convince.He is an impossible person to work...