英语介词主要表达事物间的相互关系 ,反映在句子结构上就是一种句式。文章从认知角度出发 ,主要研究介词 in句式的引申机制。 in句式中各个成分的隐喻使得 in在英语中广泛应用。笔者提出 ,in的基本句式可概括为 :TR+in+LM,表示某一物体处在容器之中。LM引申为容器的提法使很多难以解释的句子得以合理解释 English prepositions mainly express the interrelationship between things, reflected in the sentence structure is a sentence. From cognitive perspective, the article mainly studies the extended mechanism of preposition in sentence pattern. in sentences in the metaphor of each component makes in widely used in English. The author suggests that the basic sentence pattern in can be summarized as: TR + in + LM, which means that an object is in the container. The extension of LM to a container gives a reasonable explanation of many difficult to interpret sentences