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