they are waiting near the door the underlined word in the sentence is a preposition.
A preposition is a phrase or group of words used before a noun, pronoun, or noun word to show direction, time, place, location, spatial connections, or to introduce an object. Some examples of prepositions are terms like "in," "at," "on," "of," and "to." Prepositions in English are positively idiomatic.
A preposition usually precedes a noun or a pronoun. Here is a list of commonly used prepositions: above, across, against, along, among, around, at, before, behind, below, beneath, beside, between, by, down, from, in, into, near, of, off, on, to, toward, under, upon, with and within.
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