When would we extract verb phrases from a text?

I have come across plenty of material on extracting noun phrases from text. Noun phrases were defined as adjacent NN/NNS/NNP/NNPS modified by an optional JJ. It is easy to note that noun phrases are extracted to get a sense of what the text is all about and to may be generate a tag/cloud of words, or to display the distribution 开发者_开发知识库of noun phrases for a text corpus.

On the otherhand, what are the scenarios when a verb phrase would need to be extracted? What business problems exists that necessitate for the extraction of verb phrases?

Thanks Abhishek S

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On case is to extract Predicates, in most SOV langauges it is sequence of NOUN VERB NOUN. Predicate is more descriptive then pure nouns and can be used for sentiments,