I am glad to ...
结构︰主词（人）＋be 动词＋情绪形容词（如 glad，sorry…）＋不定词…。
说明︰<不定词>放在情绪<形容词>如 glad，sorry，happy，sad，surprised，troubled等字之后修饰，这是<不定词>做<副词>的用法。
I am glad to see him. 我很高兴看到他。
Sue was troubled to see trash everywhere. 苏看到到处是垃圾很苦恼。
Sara was excited to see the rock band. 莎拉看到摇滚乐团很兴奋。
... too ... to ...
结构︰主词＋动词＋too＋形容词／副词＋（for＋sb.）＋to-不定词…
说明︰此句型意为“太…而（使某人）不能…”。too 为<副词>，可修饰<副词>或<形容词>。too 后也可接含有<形容词>的单数<名词>，即“too＋<形容词>＋a＋单数<名词>＋to-<不定词>”，也可以是“too much＋<不可数名词>＋to…”或“too many＋复数<名词>＋to…”。该句型如提到“对某人来说”，则加入“for＋人”。该句型表示“否定”的意义，若加上<附加问句>，则须用否定，如例句8。
He walked too slowly to catch up with me. 他走得太慢而不能跟上我。
It is too dark in this room for me to read a book. 房间太暗，使我无法看书。
This problem is too difficult for them to settle. 这对他们来说真是一个难解的问题。
The price is too low for customers to believe. 价格低得令顾客难以相信。
He is too young a boy to do it. 他还太小，无法做这事。
He has too much work on hand to go picnicking with us.
他手头的工作太多了，不能跟我们去野餐。
He has too many things at his disposal to go home early.
有太多事要他处理，使他不能早点回家。
The boy is too young to do it, isn’t he? 这男孩年纪太轻不能做这件事，不是吗？
I am too glad not to ...
结构︰主词＋动词＋too＋形容词／副词＋not＋to-不定词…
说明︰此句型意为“太…而必能…；非常…”。本<句型>具有双重否定作用，也可将否定词移到<动词>部分。
Our professor is too capable not to solve this difficult problem.
我们教授非常有才干，必定能解决这一难题。
This customer is too honest not to deceive us. 这位客户非常诚实，不会骗我们。
I am too glad not to help the boy.我太乐意了而不能不帮助那男孩－－我非常乐意帮助那男孩。
It is never too late to learn. 活到老，学到老。
I am only too ... to ...
结构︰主词＋动词＋only too＋形容词／副词＋to-不定词
说明︰此句型意为“非常…”。only 除去了 too 的否定意义，only too 相当于 very，very much 等。
I am only too glad to accept your kind invitation. 我非常高兴地接受你的邀请。
He is only too willing to serve friends. 他极愿为朋友效劳。
I am only too pleased to do business with you. 我能和你做生意，太高兴了。
ADJ/ADV + enough to ...
结构︰主词＋动词＋…形容词／副词＋enough＋（for sb.）＋to-不定词
说明︰此句型意为“足以…”。enough 可做<副词>或<形容词>用，在此做<副词>，可修饰<副词>或<形容词>，恒置于被修饰的<副词>或<形容词>之后。
We need several men strong enough to do the work.
我们需要几个强壮得足以做这件工作的人。
They bought a house large enough for ten persons to live in.
我们买了一栋房子，大得足以供十个人住。
He is competent enough to fill that position. 他足以胜任那职位。
He ran fast enough to catch the thief. 他跑得飞快，足以抓住那小偷。
Our teacher is old enough to retire. 我们老师年纪已够得上退休了。
The assignment is few enough to be finished within half an hour.
作业很少，足能在半小时内完成。
... enough + N + to do ...
结构︰主词＋动词＋enough＋名词＋to-不定词
说明︰此句型意为“有足够的…可以做…”。该句型也可写作“主词＋动词＋名词＋enough＋to-不定词”。 enough 在此做<形容词>，修饰<名词>，可置于该<名词>之前或之后。
He has enough money (=money enough) to buy a car. 他有足够的钱买一辆汽车。
He hasn’t enough sense to realize his mistakes. 他没有足够的辨别力去认识自己的错误。
It is a pity that he doesn’t have enough money to sponsor the project.
遗憾的是他没有足够的钱来支持这项计划。
Will 2,000 dozens be enough for selling? 两千打够卖吗？
... be good enough to ...
结构︰Would you be good enough＋to-不定词…？
说明︰此句型意为“请你…好吗？”。本<句型>的意思和“Would you be so kind as to ...?”一样， <语气>较客气。
Would you be good enough to turn the radio down a bit?请你把收音机的声音关小一点好吗？
Would you be good enough to keep silent? 请你保持安静好吗？
Would you be good enough to move a bit to the right? 请你往右边移一点好吗？
... how (+ N) + to do ...
结构︰…how／what／when／where／which／whose（＋名词）＋to-不定词…
说明︰此句型意为“应该如何做／何时做／何地做／做哪些事…”。what，whom，which 为疑问<名词>，做其后 <不定词词组>中<动词>的<受词>，否则就做<介系词>的<受词>。how，where，when，why均为<疑问副
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