Breakdown of I moduli vanno convalidati e timbrati.
e
and
il modulo
the form
andare
must be (+ past participle)
timbrare
to stamp
Questions & Answers about I moduli vanno convalidati e timbrati.
Why does this sentence use vanno instead of devono essere?
Using andare as the auxiliary verb in a passive sentence adds a strong sense of obligation or necessity. While you could perfectly well say I moduli devono essere convalidati, the form vanno convalidati is shorter, more elegant, and extremely common in Italian for expressing rules, instructions, and requirements.
Why do convalidati and timbrati end in -i?
In any passive construction, the past participles act like adjectives describing the subject of the sentence. Since i moduli (the forms) is a masculine plural noun, both participles must change their endings to -i to agree with it.
Can I use this structure in compound tenses, like the passato prossimo?
No, this special passive of necessity can only be used in simple, one-word tenses, such as the present (vanno), the future (andranno), or the imperfect (andavano). You cannot say sono andati convalidati to mean they had to be validated. To express obligation in a compound tense, you must use dovere instead.
Where else am I likely to see the word convalidare?