Breakdown of È uscito senza dire una parola, e non ne abbiamo parlato.
essere
to be
una
a / an (feminine)
e
and
non
not
Questions & Answers about È uscito senza dire una parola, e non ne abbiamo parlato.
Why do we use the infinitive dire here instead of a conjugated verb?
Because the person who went out is the exact same person who didn't say a word. When the subject of the main action and the excluded action are the same, Italian uses senza followed directly by an infinitive verb. If the subjects were different, you would need to use senza che followed by a conjugated verb in the subjunctive mood.
Could we use the past infinitive here, saying senza aver detto instead of senza dire?
No, because both actions happened at the same time: he was going out and not speaking simultaneously. You use senza with a past infinitive (like avere or essere plus a past participle) only when the excluded action would have happened before the main action.
What exactly is the little word ne replacing in the second half of the sentence?
ne is a pronoun that replaces a phrase starting with di (of or about). The verb parlare takes di when you talk about something. Instead of repeating the whole idea by saying non abbiamo parlato di questo (we didn't talk about this), we replace di questo with ne and place it right before the conjugated verb.
Why does the first part use essere (è uscito) but the second part uses avere (abbiamo parlato)?