| singular | plural |
| Infinitive | | |
| investigar | |
| presente de indicativo | | |
| 1 | investigo | investigamos |
| 2 | investigas | investigáis |
| 3 | investiga | investigan |
| pretérito imperfecto | | |
| 1 | investigaba | investigábamos |
| 2 | investigabas | investigabais |
| 3 | investigaba | investigaban |
| pretérito perfecto simple | | |
| 1 | investigué | investigamos |
| 2 | investigaste | investigasteis |
| 3 | investigó | investigaron |
| futuro simple | | |
| 1 | investigaré | investigaremos |
| 2 | investigarás | investigaréis |
| 3 | investigará | investigarán |
| condicional simple | | |
| 1 | investigaría | investigaríamos |
| 2 | investigarías | investigaríais |
| 3 | investigaría | investigarían |
| presente de subjunctivo | | |
| 1 | investigue | investiguemos |
| 2 | investigues | investiguéis |
| 3 | investigue | investiguen |
| pretérito imp. de subjunctivo I | | |
| 1 | investigara | investigáramos |
| 2 | investigaras | investigarais |
| 3 | investigara | investigaran |
| pretérito imp. de subjunctivo II | | |
| 1 | investigase | investigásemos |
| 2 | investigases | investigaseis |
| 3 | investigase | investigasen |
| futuro imp. de subjunctivo | | |
| 1 | investigare | investigáremos |
| 2 | investigares | investigareis |
| 3 | investigare | investigaren |
| imperativo | | |
| 2 | investiga | investigad |
| gerundio | | |
| investigando | |
| participio pasivo | | |
| masculine | investigado | investigados |
| femininine | investigada | investigadas |
