形式体言又称形式名词,是一种不具有或极少具有实际意义、主要起语法作用的体言(名词)。形式体言在句中所起的语法作用是使前面的用言或含有活用词的句子体言化,以便它们能在句中作主语、宾语等由体言才能充当的句子成分。形式体言是日语的一大特色。虽然它本身不具有或极少具有实际意义,但其在整个句子中发挥极其重要的作用:使其前面的活用词具有体言性质的语法作用外,还给句子添加一定的意义具有画龙点睛的功效。本文主要就表示因果关系的“せい”这个形式体言的用法和意义进行论述。 Form body language, also known as formal nouns, is a type of body (noun) that does not have little or no practical meaning and that mainly functions as a grammar. Formal grammar The grammatical role played in the sentence is to make the preceding words or the sentences containing the active words so narrative so that they can function as the sentence elements in the sentence such as the subject and the object by the body language. Formal body language is a major feature of Japanese. Although it has little or no practical significance in itself, it plays an extremely important role in the whole sentence: in front of the active words have a body language grammatical role, but also to add some meaning to the sentence with the finishing touch effect. This article mainly expounds the usage and significance of the form of “ せ い ” which is causal relationship.