Based on analysis of English corpora, PRO studies in Generative grammar have shown us the evidence of the existence of PRO and its functions in sentence in terms of grammar and meaning.

生成语法中关于PRO的研究基于对英语语料的分析，论证了P RO存在的证据和语法、语义功能，并总结了P RO的分布规律和允准条件。

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She studied hard. As a result, she made fast pro GREss in the studies.

她学习用功。因此她在学习方面进步很快。

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But the researches are more involved in other elements of the pro-social behavior, the studies about sharing behavior are also relatively little.

但研究涉及更多的是亲社会行为中其他要素的研究，而对于分享行为的研究还相对比较少。

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Dr. Patrick Rishe is the Director of Sportsimpacts, a sports consulting firm specializing in market research and economic impact studies of pro and college sporting events.

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