| Yksikön ensimmäinen persoona | Yksikön toinen persoona | Yksikön kolmas persoona | Monikon ensimmäinen persoona | Monikon toinen persoona | Monikon kolmas persoona | |
|---|---|---|---|---|---|---|
| Simple present | strengthen | strengthen | strengthens | strengthen | strengthen | strengthen |
| Present continuous | am strengthening | are strengthening | is strengthening | are strengthening | are strengthening | are strengthening |
| Simple past | strengthened | strengthened | strengthened | strengthened | strengthened | strengthened |
| Simple past | was strengthening | were strengthening | was strengthening | were strengthening | were strengthening | were strengthening |
| Simple future | will strengthen | will strengthen | will strengthen | will strengthen | will strengthen | will strengthen |
| Future continuous | will be strengthening | will be strengthening | will be strengthening | will be strengthening | will be strengthening | will be strengthening |
| Present perfect | have strengthened | have strengthened | has strengthened | have strengthened | have strengthened | have strengthened |
| Present perfect continuous | have been strengthening | have been strengthening | has been strengthening | have been strengthening | have been strengthening | have been strengthening |
| Past perfect | had strengthened | had strengthened | had strengthened | had strengthened | had strengthened | had strengthened |
| Past perfect continuous | had been strengthening | had been strengthening | had been strengthening | had been strengthening | had been strengthening | had been strengthening |
| Future perfect | will have strengthened | will have strengthened | will have strengthened | will have strengthened | will have strengthened | will have strengthened |
| Future perfect continuous | will have been strengthening | will have been strengthening | will have been strengthening | will have been strengthening | will have been strengthening | will have been strengthening |
| Yksikön ensimmäinen persoona | Yksikön toinen persoona | Yksikön kolmas persoona | Monikon ensimmäinen persoona | Monikon toinen persoona | Monikon kolmas persoona | |
|---|---|---|---|---|---|---|
| Simple present | don't strengthen | don't strengthen | doesn't strengthen | don't strengthen | don't strengthen | don't strengthen |
| Present continuous | am not strengthening | are not strengthening | is not strengthening | are not strengthening | are not strengthening | are not strengthening |
| Simple past | didn't strengthen | didn't strengthen | didn't strengthen | didn't strengthen | didn't strengthen | didn't strengthen |
| Simple past | was not strengthening | were not strengthening | was not strengthening | were not strengthening | were not strengthening | were not strengthening |
| Simple future | won't strengthen | won't strengthen | won't strengthen | won't strengthen | won't strengthen | won't strengthen |
| Future continuous | will not be strengthening | will not be strengthening | will not be strengthening | will not be strengthening | will not be strengthening | will not be strengthening |
| Present perfect | have not strengthened | have not strengthened | has not strengthened | have not strengthened | have not strengthened | have not strengthened |
| Present perfect continuous | have not been strengthening | have not been strengthening | has not been strengthening | have not been strengthening | have not been strengthening | have not been strengthening |
| Past perfect | had not strengthened | had not strengthened | had not strengthened | had not strengthened | had not strengthened | had not strengthened |
| Past perfect continuous | had not been strengthening | had not been strengthening | had not been strengthening | had not been strengthening | had not been strengthening | had not been strengthening |
| Future perfect | will not have strengthened | will not have strengthened | will not have strengthened | will not have strengthened | will not have strengthened | will not have strengthened |
| Future perfect continuous | will not have been strengthening | will not have been strengthening | will not have been strengthening | will not have been strengthening | will not have been strengthening | will not have been strengthening |