| Present "diagnose" | I | diagnose | |
| Present Continuous "diagnose" | I | am diagnosing | |
| Simple past "diagnose" | I | diagnosed | |
| Past Continuous "diagnose" | I | was diagnosing | |
| Present perfect "diagnose" | I | have diagnosed | |
| Present perfect continuous "diagnose" | I | have been diagnosing | |
| Past perfect "diagnose" | I | had diagnosed | |
| Past perfect continuous "diagnose" | I | had been diagnosing | |
| Future "diagnose" | I | will diagnose | |
| Future continuous "diagnose" | I | will be diagnosing | |
| Future perfect "diagnose" | I | will have diagnosed | |
| Future perfect continuous "diagnose" | I | will have been diagnosing |