53.Would you be so kind as to lend me your bicycle?
54.He was so foolish as to believe such a man 。
他如此愚蠢以至于相信了这样一个人。
Such…as to如此……以至于……作结果状语：
55.Don't be so upset ,my illness is not such as to cause anxiety。
别忧心忡忡，我的病不至于那么严重。
56.He is such a fool as to think that he is somebody and can influence others。
他愚蠢的认为他是个了不起的大人物，可以影响其他人。
…enough to…作结果状语，足够……可以……
57.He is old enough to go to school。
他不小了，可以上学了。
58.To our great surprise,child as he is ,he is bold enough to rob passers-by。
使我们感到非常惊讶的是，他虽然是个孩子，却大胆到去拦路抢劫。
59.The champion ran well enough to set up another world record indeed if she had tried harder,
她的确跑得相当快，不过要是她再努力一些，作为冠军就会再次创造一个世界记录。
60.We are old enough to make a great difference to the world。
我们不小了，可以对这个世界有所影响了。
Too…to…作结果状语，太……而不能……
61.In my opinion ,the real problem with most students lies in the fact that they are too shy to speak English in public。
在我看来，很多学生的问题在于他们羞于在公共场合说英语。
62.We are never too old to learn。
活到老，学到老。
63.He is too clever not to read our tricks。
他非常聪明完全可以识破我们的诡计。
Can't/can never和too ,too much,enough ,over-搭配表示“无论怎样……都不过分”
64.While you are doing your homework,you can't be careful enough。
你做作业的时候，越小心越好。
65.He is such a great man that we can't praise him too much。
他如此伟大，我们无论怎样赞扬他都不过分。
66.The development of society has made it necessary for us to have a good knowledge of English,so we can't overemphasize the importance of learning English
社会的发展使我们有必要精通英语，因此学习英语的重要性无论怎么强调都不过分。
67.Since it's a good thing ,we can't do it too soon。
既然是好事，越早开始做越好。
不定式作主语，it做形式主语
It +系动词（be,seem…）+adj./n.+（for sb。）+to do sth。
68.It is important for us to have a good knowledge of English。
精通英语很重要。
69.It's our duty to help others 。
帮助别人是我们的义务。
70.It's a pleasure （for us ）to go picnicking in such pleasant weather。
71.It's normal for the professional workers these days to prefer to live in the countryside。
72.It's a pity for there to be any disagreement in the family。