then (Adjective) — At a specific prior time. ex. "the then president"
then (Noun) — That time; that moment. ex. "we will arrive before then" ex. "we were friends from then on"
then (Adverb) — Subsequently or soon afterwards (often used as a sentence connector). ex. "then he left" ex. "go left first, then right" ex. "first came lightning, then thunder" ex. "we watched the late movie and then went to bed"
then (Adverb) — In that case or as a consequence. ex. "if he didn't take it, then who did?" ex. "keep it then if you want to" ex. "the case, then, is closed" ex. "you've made up your mind then?" ex. "then you'll be rich"
then (Adverb) — At that time. ex. "I was young then" ex. "prices were lower back then" ex. "science as it was then taught"