Color Key
| Regular | Irregular |
| Ortho. Change | Not Used |
oponerse
to go against, to oppose, to object, to play off, to put up
Preterite (Past) Tense / Pretérito (Pretérito Perfecto Simple)
| me | opuse |
| te | opusiste |
| se | opuso |
| nos | opusimos |
| os | opusisteis |
| se | opusieron |