Question

back is preposition or not.

Answer 1

----------here is ur answer----------
back is noun,adverb,verb,and adjective
hope it helps u

Answer 2

A preposition is a part of speech used to connect a noun or pronoun. Back is obviously not used in this way here. serves the function of controlling/modifying the verb put, so it is an adverb.The only prepositionhere is on, as it connects the noun ... thanku..