| singular | plural |
| Infinitive | | |
| diagnose | |
| present simple | | |
| 1 | I diagnose | we diagnose |
| 2 | you diagnose | you diagnose |
| 3 | he/she/it diagnoses | they diagnose |
| past simple | | |
| 1 | I diagnosed | we diagnosed |
| 2 | you diagnosed | you diagnosed |
| 3 | he/she/it diagnosed | they diagnosed |
| future simple | | |
| 1 | I will/shall diagnose | we will/shall diagnose |
| 2 | you will/shall diagnose | you will/shall diagnose |
| 3 | he/she/it will/shall diagnose | they will/shall diagnose |
| conditional simple | | |
| 1 | I would diagnose | we would diagnose |
| 2 | you would diagnose | you would diagnose |
| 3 | he/she/it would diagnose | they would diagnose |
| present continuous | | |
| 1 | I am diagnosing | we are diagnosing |
| 2 | you are diagnosing | you are diagnosing |
| 3 | he/she/it is diagnosing | they are diagnosing |
| past continuous | | |
| 1 | I was diagnosing | we were diagnosing |
| 2 | you were diagnosing | you were diagnosing |
| 3 | he/she/it was diagnosing | they were diagnosing |
| future continuous | | |
| 1 | I will be diagnosing | we will be diagnosing |
| 2 | you will be diagnosing | you will be diagnosing |
| 3 | he/she/it will be diagnosing | they will be diagnosing |
| conditional continuous | | |
| 1 | I would be diagnosing | we would be diagnosing |
| 2 | you would be diagnosing | you would be diagnosing |
| 3 | he/she/it would be diagnosing | they would be diagnosing |
| present perfect | | |
| 1 | I have diagnosed | we have diagnosed |
| 2 | you have diagnosed | you have diagnosed |
| 3 | he/she/it has diagnosed | they have diagnosed |
| past perfect | | |
| 1 | I had diagnosed | we had diagnosed |
| 2 | you had diagnosed | you had diagnosed |
| 3 | he/she/it had diagnosed | they had diagnosed |
| future perfect | | |
| 1 | I will have diagnosed | we will have diagnosed |
| 2 | you will have diagnosed | you will have diagnosed |
| 3 | he/she/it will have diagnosed | they will have diagnosed |
| conditional perfect | | |
| 1 | I would have diagnosed | we would have diagnosed |
| 2 | you would have diagnosed | you would have diagnosed |
| 3 | he/she/it would have diagnosed | they would have diagnosed |
