不定式 （一）
分为带TO与不带TO两类：
不带TO的情况：一：在情态动词之后，e.g You must do as you’re told.
              二；在情态成语之后，would rather/would sooner/would as soon/cannot but/cannot help but等  e.g We could not but weep at the sad news.
              三 rather than/sooner than为于句首时，为于句子其它位置时可带可不带
              四：在“主动词+主动词”的第一主动词后 (make believe（假装）/make do（凑合 将就）/let drop/let fall（有意无意说出）/let fly（发出）/let slip（无意说出）/let go of（放开）/go hang（见鬼去吧）   e.g Let’s make believe we have a million dollars.
                五、在”let,make,have 等使役动词+宾语。当使役动词为被动时就要还原to.
                六．在see,hear,feel等感官动词+宾语后，为被动时都得还原to
                七．如果except、but之前有动词do的某种形式，通常不带to 否则就带to  e.g They did nothing except work.
              八．在why……/why not……之后
              九．在一些口语中 e.g Go past / Try eat
不定式符号to与介词to的辨别：
动词+介词to：常见搭配有：add to(增加) / agree to / admit to（承认）/ adhere to（坚持）/ allude to（暗示）/ amount to（总计）/ attend to（注意）/ attest to（证明）/ bow to（顺从）/ cling to（坚持）/ come to / correspond to（相当于）/ confess to（承认）/ consent to（答应）/ object to（反对）/ pertain to（属于）/ react to（反应）/ resort to（诉诸）/ revert to（回复旧习惯）/ refer to / submit to（顺从）/ succeed to（继承）/ stick to / swear to（强调地说）/ take to（从事）/ trust to（依赖）/ witness to（作证）/ yield to(让步屈服)等 e.g He admitted to having taken the money.
动词+名词、代词+介词to：ascribe…to(归因于) / apply…to(致力于) / abbreviate…to(缩写为)
/ accustom…to(使习惯于) / dedicate…to(奉献) / owe…to(归功于) / reconcile…to(安于) / reduce…to(使变小，降低) / resign…to(听任)等  e.g He attributes his success to hard work.
Be+ed分词+介词to：be accustomed to / be reduced to / 等以上的词皆可 e.g He was reduced to begging for food.
动词+副词小品词+介词to：get round to(到时间做) / get down to(开始做) / get near to(几乎) / face up to(勇敢地面对) / feel up to(有条件做) / look forward to(期待) 等
形容词+介词to： adjacent to(毗连) / averse to(嫌恶) / deaf to（不愿意听）/ equal to（有力量） / loyal to / preferable to（较合人意的）/ similar to / superior to（胜于）/ sensitive to / tantamount to（相当于）等 e.g That is tantamount to saying that you do not agree.
以介词to结尾的复杂介词：according to(据)/as to(关于)/owing to(由于)/preliminary to(在…以前)/preparatory to(为…准备)/previous to(在…以前)/prior to(在…以前)/with a view to(为…目的)/with an eye to(为…起见)
练习题：1 I have a few letters to write preparatory to beginning the day’s work.
        2 They hoped he would own up to telling the lie.
        3 Restraining home demand is the key to increasing our export
        4 It’s might be better to try to discuss it in his own language, as he isn’t used to speaking English.
        5 Since the introduction of new services, many bussinessmen have taken to traveling by train for journeys between 100-200miles.
                              不定式二
不定式与形容词的搭配：1 It is +adj.+of sb+to do sth. 
                      2 It is +adj.+for sb+to do sth.
                      3 Sb+be +adj.+to do sth.
不定式与名词的搭配：用主动还是被动意义没有很大差别 react to的用法要视情况而定
                    在如 attempt, chance, effort, freedom, intention, necessity, opportunity, reason, time, way 等词后用“名词+不定式”与“名词+介词+ing分词”无太大区别。
                    在如 ability, agreement, ambition, anxiety, curiosity, disposition(意向), mind, obligation(职责), permission, refusal, reluctance(厌恶), temptation, tendency(倾向), wish 等词后通常用不定式。
动词+不定式：只能带不定式的：agree, aim, apply, arrang, choose, claim, decide, demand, desire, determine, endeavour(尽力), expect, hope, learn, manage, offer, pledge(保证), prepare, pretend, profess, promise, refuse, resolve, seek, swear, threaten, undertake, venture, volunteer, vow 等

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