| Present Simple - Presente (Present) "refine" | I | refine | |
| Presente Contínuo (Present Continuous) (Present Continuous) "refine" | I | am refining | |
| Tempo passado (Simple past) "refine" | I | refined | |
| Passado Contínuo (Past Continuous) "refine" | I | was refining | |
| Present Perfect (Present perfect) "refine" | I | have refined | |
| Perfeito Presente Contínuo (Present Perfect Continuous) "refine" | I | have been refining | |
| Past Perfect (Present perfect) "refine" | I | had refined | |
| Perfeito presente contínuo (Past perfect continuous) "refine" | I | had been refining | |
| O futuro (Future) "refine" | I | will refine | |
| Futuro do Pretérito (Future Continuous) "refine" | I | will be refining | |
| Futuro (Future perfect) "refine" | I | will have refined | |
| Perfeito Futuro do Pretérito (Future perfect continuous) "refine" | I | will have been refining |