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