| singular | plural |
| Infinitive | | |
| excusar | |
| presente de indicativo | | |
| 1 | excuso | excusamos |
| 2 | excusas | excusáis |
| 3 | excusa | excusan |
| pretérito imperfecto | | |
| 1 | excusaba | excusábamos |
| 2 | excusabas | excusabais |
| 3 | excusaba | excusaban |
| pretérito perfecto simple | | |
| 1 | excusé | excusamos |
| 2 | excusaste | excusasteis |
| 3 | excusó | excusaron |
| futuro simple | | |
| 1 | excusaré | excusaremos |
| 2 | excusarás | excusaréis |
| 3 | excusará | excusarán |
| condicional simple | | |
| 1 | excusaría | excusaríamos |
| 2 | excusarías | excusaríais |
| 3 | excusaría | excusarían |
| presente de subjunctivo | | |
| 1 | excuse | excusemos |
| 2 | excuses | excuséis |
| 3 | excuse | excusen |
| pretérito imp. de subjunctivo I | | |
| 1 | excusara | excusáramos |
| 2 | excusaras | excusarais |
| 3 | excusara | excusaran |
| pretérito imp. de subjunctivo II | | |
| 1 | excusase | excusásemos |
| 2 | excusases | excusaseis |
| 3 | excusase | excusasen |
| futuro imp. de subjunctivo | | |
| 1 | excusare | excusáremos |
| 2 | excusares | excusareis |
| 3 | excusare | excusaren |
| imperativo | | |
| 2 | excusa | excusad |
| gerundio | | |
| excusando | |
| participio pasivo | | |
| masculine | excusado | excusados |
| femininine | excusada | excusadas |
