Question

please tell me about what is preposition​

Answer 1

Answer:

Prepositions and postpositions, together called adpositions, are a class of words used to express spatial or temporal relations or mark various semantic roles

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Answer 2

Answer:

word governing, and usually preceding, a noun or pronoun and expressing a relation to another word or element in the clause

Explanation:

in simple words it is nothing but used to express the baground of the noun