| Obecny (Present) "ascertain" | I | ascertain | |
| Niniejszy seryjne (Present Continuous) "ascertain" | I | am ascertaining | |
| Czas przeszły (Simple past) "ascertain" | I | ascertained | |
| Dotychczasowe seryjne (Past Continuous) "ascertain" | I | was ascertaining | |
| Present Perfect (Present perfect) "ascertain" | I | have ascertained | |
| Niniejszy seryjne (Present perfect continuous) "ascertain" | I | have been ascertaining | |
| Past Perfect (Past perfect) "ascertain" | I | had ascertained | |
| Dotychczasowe seryjne (Past perfect continuous) "ascertain" | I | had been ascertaining | |
| Przyszłość (Future) "ascertain" | I | will ascertain | |
| Przyszłe ciągły (Future continuous) "ascertain" | I | will be ascertaining | |
| Future Perfect (Future perfect) "ascertain" | I | will have ascertained | |
| Przyszłe doskonałe ciągły (Future perfect continuous) "ascertain" | I | will have been ascertaining |