~しそう in English to feel to/to seem to/ to frighten etc one sence to chach a fear, happiess and sence this is case kaeru te form + kuru (ikou form(ki)+sou is actual conjugation this case cosisted 2 verb Kaeru+kuru + adverb sou frist 2 verb is shows one action and additionally feeling kison is wrong diveding piont kaettekuru + sou and conjugation is right style not this case そう other mean is almostly happen to do in other usage hanashisou ( I almost speek out )