Between is primarily a preposition, but it can also function as an adverb in a limited number of sentence patterns. If you are asking, “between is what part of speech?” the most accurate answer is that it is usually a preposition because it shows the relationship between a noun or pronoun and another element in the sentence. On the flip side, English is flexible, and between can behave adverbially when it means “in the middle” or “in the space separating two things” without taking a direct object. Understanding both roles helps you use the word correctly and recognize it in different contexts.
The Short Answer: Between Is Usually a Preposition
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