CERRAR (TO CLOSE/TO SHUT)

A common type of radical changing verb.  The endings are those of regular -ar verbs, but the e of the stem changes to ie when stressed.  All forms are as for a regular -ar verb, save (bracketed forms are regular)

Imperative: (tú) cierra, (usted) cierre, (ustedes) cierren
Present indicative: cierro, cierras, cierra, (cerramos), (cerráis), cierran
Present subjunctive: cierre, cierres, cierre, (cerremos), (cerréis), cierren