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不定式动词（the infinitive）或不定式动词短语（the infinitive phrase）的功能之一是修饰动词。这种具副词功能的不定式动词或短语，和分词短语一样，可以在句子中发挥不同作用，包括目的、结果、原因、比较。 Ⅰ表示目的，如： ● To learn a language well, one must make great efforts and work with tenacity. ● To prevent war, big or small, it is important to promote international understanding. ● Zhiqiang came to my office to ask a question. ● The warden walked around the building to see that nothing went wrong. 表示目的的不定式动词短语可以在句首，也可以在句尾。在句首时，可以加上in order；在句尾时，可以附以so as，如： ● In order to win the table-tennis match, the players practised day and night. ● Betty worked very hard so as to catch up with the rest of the class. Ⅱ表示结果，如： ● Indonesia beat Denmark to take the first place in the badminton tournament. ● Sam passed the final examination to qualify for the next phase of study. 表示结果的不定式动词短语出现在句尾，而且经常以预料不到的情况出现，如： ● After the short meeting, they separated, never to see each other again. | 
