| Presente (Present) "doubt" | I | doubt | |
| Presente Progressivo (Present Continuous) "doubt" | I | am doubting | |
| Passato semplice (Simple past) "doubt" | I | doubted | |
| Past Continuous (Past Continuous) "doubt" | I | was doubting | |
| Regalo perfetto (Present perfect) "doubt" | I | have doubted | |
| Trapassato prossimo (Present perfect continuous) "doubt" | I | have been doubting | |
| Passato perfetto (Past perfect) "doubt" | I | had doubted | |
| Trapassato remoto (Past perfect continuous) "doubt" | I | had been doubting | |
| Futuro (Future) "doubt" | I | will doubt | |
| Trapassato remoto (Future continuous) "doubt" | I | will be doubting | |
| Futuro perfetto (Future perfect) "doubt" | I | will have doubted | |
| Congiuntivo (Future perfect continuous) "doubt" | I | will have been doubting |