【练习】
1.??There _____ (be) no rain for a long time, most of the crops in this area died from lacking water.（填空练习）
答案：??being
解析：??There being no rain为 there be句型的独立主格形式。
2.Yesterday a street-beggar bought a lottery ticket purposelessly, _____(make) ?him a millionaire overnight.（填空练习）
答案：?to make?
?解析：?不定式作结果状语表示主语未曾预料到的结果。
3.?He hurried to the station,_____the 9：30 train had already left.
A.to find?? B.found?? C.only to find?? D.only finding
答案：?C
解析：?本题考查"（only）＋不定式"与"-ing形式"作结果状语的区别。"only＋不定式"表示该结果在主语的预料之外；接"-ing"形式表示由主句所产生的逻辑上的结果。
4.?Which do you enjoy_____your weekends, fishing or watching TV?
A.spending?? B.to spend?? C.being spent?? D.spend答案：?B
解析：?本题考查不定式作目的状语,本题极易误选A。其实 enjoy的宾语为fishing or watching TV。
5.?As a result of my laziness, I failed ________ my work intime.
A. and finished ? ?B. to finish ? ? ?C. and finishing ? ? D. to finished答案：?B
解析：?fail to do sth. 固定短语,"没有能够…".A项句子意义不通,D项表达不对.
6.?The boy often gives a satisfactory answer to the teacher’s question, _____(think) ?just a minute. So he’s usually the teacher’s pet.?（填空练习）
答案：?having thought
解析：?-ing形式短语作状语，且think(思考)表示的动作发生于give a satisfactory answer之前，故用having thought。
【小知识】动词不定式的基本用法
（1）动词不定式在句中作宾语，如带有宾语补足语时，须先用it作形式宾语，而将该动词不定式后置，如：I don’t think it right to do it that way.
（2）作定语：动词不定式作定语时，须位于被其修饰的名词或代词之后，如：Is this the best way to help him?
和定语用的动词不定式如果是不及物动词，不定式后面就要用必要的介词，如：He is the man to depend on.
如果被不定式修饰的名词为place, time, way，不定式后面的介词，习惯上可以省去，如：The old man is looking for a quiet place to live. ?
