This week another slightly irregular -ar verb. This time it is the forms with a stressed 'e' which change to 'ie'. Again this is quite common in Spanish, with many verbs containing an 'e' in the second last sylable transforming in the same way. See previous posts in this series for more about conjugations.
Cerrar = To close
cierro = I close
cierras = you close (sing. fam.)
cierre = he/she/you (sing. pol.) close(s)
cerramos = we close
cerráis = you close (pl. fam.)
cierran = they/you (pl. pol) close