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