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