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Avendo inventato il vaccino, il dottore ha promesso di curare la malattia.

Avendo inventato il vaccino, il dottore ha promesso di curare la malattia.
Having invented the vaccine, the doctor promised to cure the disease.
From Lesson 197:Past gerund (avendo…, essendo…)·Italian

Questions & Answers about Avendo inventato il vaccino, il dottore ha promesso di curare la malattia.

Why use avendo inventato instead of a regular past tense like aveva inventato?
Avendo inventato is the past gerund. It neatly connects two actions by the same subject, showing both time (the invention happened before the promise) and cause (he promised because he had the vaccine). It is a smoother, more advanced way to say poiché aveva inventato (since he had invented).
How do I know whether to use avendo or essendo to form the past gerund?
You use the exact same auxiliary (helper) verb that the main verb takes in the passato prossimo. Because inventare takes avere (as in ha inventato), the past gerund uses avendo. If the verb took essere (like andare), you would use essendo.
Could I use this avendo... structure if someone else made the promise?
Generally, no. A strict rule for using the gerund in Italian is that the implied subject of the gerund phrase (avendo inventato) must be exactly the same as the subject of the main clause (il dottore).
Why is there a di between ha promesso and curare?
Certain Italian verbs require a specific preposition to connect them to an infinitive verb. Promettere (to promise) is one of them; it always links to the next verb with di. So, to promise to do something is always promettere di fare qualcosa.

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