| Present "acknowledge" | I | acknowledge | |
| Present Continuous "acknowledge" | I | am acknowledging | |
| Simple past "acknowledge" | I | acknowledged | |
| Past Continuous "acknowledge" | I | was acknowledging | |
| Present perfect "acknowledge" | I | have acknowledged | |
| Present perfect continuous "acknowledge" | I | have been acknowledging | |
| Past perfect "acknowledge" | I | had acknowledged | |
| Past perfect continuous "acknowledge" | I | had been acknowledging | |
| Future "acknowledge" | I | will acknowledge | |
| Future continuous "acknowledge" | I | will be acknowledging | |
| Future perfect "acknowledge" | I | will have acknowledged | |
| Future perfect continuous "acknowledge" | I | will have been acknowledging |