Nelle frasi condizionali formali, if si può omettere invertendo soggetto e ausiliare.
| Con "if" | Invertita |
|---|---|
| If I were you | Were I you |
| If he had known | Had he known |
| If you should need help | Should you need help |
- Had I known, I would have told you.
- Should you have any questions, please contact us.
Quando si usa
Solo in registro formale: lettere commerciali, contratti, scrittura elevata. Nel parlato si usa if.
Attenzione
Funziona solo con were, had e should: non si può invertire un condizionale qualsiasi.
- Had I known ✅ — Knew I ❌
E la forma invertita non ammette la negazione contratta: si dice Had it not been for you, non Hadn't it been for you.