~봐:means that it seems like or it looks like ~는가봐, ~나봐: means it seems that someone or something do something. it may contains little surprising expressions depending on speakers nuance or accent. ~는건가봐:it is the past tense of above. ~나보다:means it looks like that someone or something do something. ~구나:means determining what someone or something did. ~구먼?: it is a dialect in the south province of Korea. means "Did you or something do something?"