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相关背景知识介绍: 非谓语动词结构可以简单地分为：不定式、动名词、分词-ing和分词-ed式。不同类型的非谓语动词在句中起着不同的语法功能，而且它们也存在着语态和时态的变化。非谓语动词结构在书面语中用的很多，如：A Thirsty World In addition to stopping wasting precious water, one useful step we should take is to develop ways of reusing it. Experiments have already been done in this field, but only on a small scale. Today, in most large cities, water is used only once and it eventually returns to the sea or runs into underground storage tanks. But it is possible to pipe water用管子输送 that has been used to a purifying使纯净 plant . precious -- valuable 珍贵的 小节： 1. 非谓语结构一定是由于前面结构的需要而出现; 2. 不定式结构的构成是： to + v.;动名词结构的构成是： v.ing 3. 介词和及物动词的后面需要出现名词或动名词结构; 系动词后面可以跟表示动作发生在将来的不定式结构。 对于不定式结构具有名词的性质这个特点， 建议大家可以记住这个句子： To err is human. 人非圣人孰能无过。 | 
