costarto cost conjugated like contarirregular verb cost· ar + cuest· as AR Boot Present Subjunctive Preterite Imp.Subj. Future Conditional Imperfect yo tú él nosotros vosotros ellos cuest o cuest e cost é cost ara cost aré cost aría cost aba cuest as cuest es cost aste cost aras cost arás cost arías cost abas cuest a cuest e cost ó cost ara cost ará cost aría cost aba cost amos cost emos cost amos cost áramos cost aremos cost aríamos cost ábamos cost áis cost éis cost asteis cost arais cost aréis cost aríais cost abais cuest an cuest en cost aron cost aran cost arán cost arían cost aban Gerund: cost ando Participle: cost ado