| Présent (Present) "concentrate" | I | concentrate | |
| Présent continu (Present Continuous) "concentrate" | I | am concentrating | |
| Passé (Simple past) "concentrate" | I | concentrated | |
| Passé antérieur (Past Continuous) "concentrate" | I | was concentrating | |
| Présent parfait (Present perfect) "concentrate" | I | have concentrated | |
| Continu Présent (Present perfect continuous) "concentrate" | I | have been concentrating | |
| Imparfait (Past perfect) "concentrate" | I | had concentrated | |
| Plus-que-parfait (Past perfect continuous) "concentrate" | I | had been concentrating | |
| Futur simple (Future) "concentrate" | I | will concentrate | |
| Futur (Future continuous) "concentrate" | I | will be concentrating | |
| Futur antérieur (Future perfect) "concentrate" | I | will have concentrated | |
| Futur antérieur continu (Future perfect continuous) "concentrate" | I | will have been concentrating |