D．withwithout + 名词 + 不定式结构   “withwithout + 名词 + 不定式”结构在句子中通常起状语的作用。   With so much work to do, I shall not be able to go to the cinema with you. 有这么多工作要做，我不能和你去看电影了。   With him to stay in the house, I feel quite safe. 有他住在家里，我感到十分安全。   Without anything to eat, he died of hunger. 由于没有东西吃，他饿死了。

　　E．It is + 形容词 + forof sb + to do 结构   在“It is +形容词+ of sb +不定式”结构中，形容词往往表示人物的性格和特征，如kind, silly, good, unwise, clever, wrong, right, foolish, stupid, careless, rude, impolite, bold, thoughtful, honest, bad, sensible, naughty等。在“It is +形容词+for sb +不定式”结构中，形容词通常表示事物的性质，如important, possible, impossible, necessary, difficult, hard, reasonable等。   It's kind of you to think so much of us.  难为你这么为我们着想。(= You are kind to think so much of us.)   How careless it is of him to break such a valuable vase! 他真不小心，把如此贵重的花瓶打破了。   It is easy for me to see through his trick. 我很容易看穿他的鬼把戏。(=For me to see through his trick is easy.)   It is hard for him to get rid of his bad habits. 他很难改掉自己的坏习惯。   比较：   It is good lf you to help me with my English.  你真好，帮助我学英语。（强调you 的特征＝You are good to help me.）   It is good for you to give up smoking.   戒烟对你有好处。（强调的是give up smoking 这一行为＝Fof you to give up smoking is good.）

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