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