Breakdown of I ragazzi hanno riso dopo aver visto la giostra.
il ragazzo
boy
avere
to have
vedere
to see
dopo
after
Questions & Answers about I ragazzi hanno riso dopo aver visto la giostra.
Why does the sentence use dopo aver visto instead of a word that translates exactly to "seeing"?
In English, we usually say "after seeing" or "after doing" something. In Italian, when the same people do both actions (the boys laughed, and the boys saw the ride), you use dopo followed by the past infinitive. You build this by putting the helper verb (avere or essere) in its infinitive form, followed by the past participle of your main verb (visto).
Why is it aver visto and not avere visto?
Doesn't riso mean "rice"? Why is it used here?
It does mean "rice" when used as a noun! However, here riso is the irregular past participle of the verb ridere (to laugh). Combined with the helper verb hanno, hanno riso means "they laughed" or "they have laughed".
Which verb does visto come from?
Visto is the irregular past participle of vedere (to see). Because it's a completely irregular form, it has to be memorized. You'll use it exactly the same way here in the past infinitive as you do in the normal past tense (the passato prossimo).