Question

is then a preposition?
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Answer 1

Answer:

no.

Then is not a preposition

As it does not show a position

Prepositions show a position like

over

above

in

on

behind

next to

Answer 2

Answer:

'then' can be an adjective, a noun or an adverb. Noun usage: It will be finished before then. Adverb usage: He was happy then. Adverb usage: He fixed it, then left.