不定式作定语都应放在它所修饰的名词或代词后面。

1． only, last, next, 序数词或形容词最高级修饰的名词常用不定式作定语，如：
　　She is always the first one to come and the last one to leave.
　　That will be the only thing to do now.
　　That is the shortest way to go to the station.

2． 不定式常用作下列名词（大多为抽象名词）或代词的定语：ability, ambition, anything,
　attempt, capability, chance, courage, curiosity, desire, decision, determination, effort,
　failure, intention, need, nothing, opportunity, place, plan, promise, reason, right,
　something, tendency, time, way, wish等，如：
　　This will be a good opportunity to exchange experience.
　　All substances have some ability to conduct electricity.

　不定式作定语如果与修饰的名词或代词有动宾关系，应注意不及物动词的不定式后要带
　介词， 并且不定式后不能再带宾语，如：
　　There is nothing to worry about.(不能掉about)
　　The teacher assigned us some exercises to do.（不能在do后加them)