Dropping Prepositions Before 'Che'
Many Italian verbs are naturally paired with a specific preposition when they are followed by a noun or a pronoun. For example, you say accertarsi di (to make sure of) or dubitare di (to doubt).
However, there is a strict rule in Italian syntax: these mandatory prepositions must be dropped completely when the verb is followed by the declarative conjunction che (that).
You cannot say Mi accerto di che...; instead, the preposition vanishes, leaving just Mi accerto che....
| I always make sure that the supply arrives early. | Mi accerto sempre che la fornitura arrivi in anticipo. |
| We sent a reminder because we doubt that the client will pay. | Abbiamo mandato un sollecito perché dubitiamo che il cliente paghi. |
Dropping 'Su'
This rule applies to any preposition normally required by a verb, not just di. Verbs that typically take su (on)—such as scommettere (to bet on) or contare (to count on)—also lose their preposition before che.
| I bet that the negotiation will be advantageous for our company. | Scommetto che la trattativa sarà vantaggiosa per la nostra azienda. |
| I am counting on you to give me positive feedback. | Conto che Lei mi dia un riscontro positivo. |
Expressing Trust, Emotion, and Complaints
This structure is extremely common in business contexts when discussing expectations, agreements, or feedback. Verbs expressing trust (fidarsi di), surprise (meravigliarsi di), and dissatisfaction (lamentarsi di) follow the exact same pattern.
Notice that because these verbs express doubt, emotion, trust, or expectation, the verb inside the che clause will typically take the subjunctive mood.
| I trust that you will settle the invoice. | Mi fido che Lei saldi la fattura. |
| I was surprised that the client settled the bill so early. | Mi sono meravigliato che il cliente abbia saldato il conto così presto. |
| The client complains that the supply is late. | Il cliente si lamenta che la fornitura sia in ritardo. |