Prepositions and conjunctions are particles.
介词和连词是小品词。
But "is a very commonly used word. It can be used as a conjunction, a preposition, an adverb and a relative pronoun in sentences."
是一个十分常用的词，它既可以作连词、介词、副词及代词，又可以和其它词组合构成短语来表示许许多多的意思。
They are certain words and short lexicalized phrases with pragmatic functions, including some conjunctions, adverbs, and prepositional phrases.
它们是一些在话语中起语用作用的词语或结构，主要包括部分连词、副词以及一些介词。
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