In modern Swedish, verbs are not conjugated in person or number; the same verb form is used for all persons in singular and plural.
| Infinitive | diagnosticera |
| Present | diagnosticerar |
| Past | diagnosticerade |
| Imperative | diagnosticera |
| Supine | diagnosticerat |
Until the beginning of the 20th century, Swedish verbs had distinct forms for singular and plural. The forms below show the verb conjugated in all moods, tenses, numbers, and persons.
| jag | diagnosticerar |
| du | diagnosticerar |
| han;hon | diagnosticerar |
| vi | diagnosticera |
| ni | diagnosticera |
| de | diagnosticera |
| jag | har diagnosticerat |
| du | har diagnosticerat |
| han;hon | har diagnosticerat |
| vi | ha diagnosticerat |
| ni | ha diagnosticerat |
| de | ha diagnosticerat |
| jag | diagnosticerade |
| du | diagnosticerade |
| han;hon | diagnosticerade |
| vi | diagnosticerade |
| ni | diagnosticerade |
| de | diagnosticerade |
| jag | hade diagnosticerat |
| du | hade diagnosticerat |
| han;hon | hade diagnosticerat |
| vi | hade diagnosticerat |
| ni | hade diagnosticerat |
| de | hade diagnosticerat |
| jag | skulle diagnosticera |
| du | skulle diagnosticera |
| han;hon | skulle diagnosticera |
| vi | skola diagnosticera |
| ni | skola diagnosticera |
| de | skola diagnosticera |
| jag | skulle ha(va) diagnosticerat |
| du | skulle ha(va) diagnosticerat |
| han;hon | skulle ha(va) diagnosticerat |
| vi | skola ha(va) diagnosticerat |
| ni | skola ha(va) diagnosticerat |
| de | skola ha(va) diagnosticerat |
| jag | må diagnosticera |
| du | må diagnosticera |
| han;hon | må diagnosticera |
| vi | må diagnosticera |
| ni | må diagnosticera |
| de | må diagnosticera |
| jag | må ha(va) diagnosticerat |
| du | må ha(va) diagnosticerat |
| han;hon | må ha(va) diagnosticerat |
| vi | må ha(va) diagnosticerat |
| ni | må ha(va) diagnosticerat |
| de | må ha(va) diagnosticerat |
| jag | skulle diagnosticera |
| du | skulle diagnosticera |
| han;hon | skulle diagnosticera |
| vi | skulle diagnosticera |
| ni | skulle diagnosticera |
| de | skulle diagnosticera |
| jag | skulle ha(va) diagnosticerat |
| du | skulle ha(va) diagnosticerat |
| han;hon | skulle ha(va) diagnosticerat |
| vi | skulle ha(va) diagnosticerat |
| ni | skulle ha(va) diagnosticerat |
| de | skulle ha(va) diagnosticerat |
| jag | skulle diagnosticera |
| du | skulle diagnosticera |
| han;hon | skulle diagnosticera |
| vi | skulle diagnosticera |
| ni | skulle diagnosticera |
| de | skulle diagnosticera |
| jag | skulle ha(va) diagnosticerat |
| du | skulle ha(va) diagnosticerat |
| han;hon | skulle ha(va) diagnosticerat |
| vi | skulle ha(va) diagnosticerat |
| ni | skulle ha(va) diagnosticerat |
| de | skulle ha(va) diagnosticerat |
| du | diagnosticera |
| vi | Låt oss diagnosticera |
| ni | diagnosticera |