第一条定义是动词go和介词ahead的简单搭配，算不上短语。
在研究英语介词相关短语和句式的基础上，给出了语义模式的概念，构建了介词相关短语语义模式库、相关句式语义模式库、主虚量库和固定搭配知识库。
This paper presents the concept of semantic pattern, and constructs semantic pattern base of English preposition phrases and sentences, major parameter base and knowledge base of English set phrases.
实验表明，采用WAD作为词语搭配评判标准，对由动宾短语和介词短语引发的错误有较强的识别能力，正确率高达99.97%。
Validated by the experiments, the WAD has a strong ability to distinguish the errors cased by verb-object phrases and preposition phrases, and the precision reaches 99.97%.
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