Falling or suspended
At the end of an utterance the voice has two basic options. It falls low: the statement is complete and stands. Or it stays at mid height, suspended, often with a slight rise and a drawn-out last syllable. This is called intonazione sospensiva: something is left unsaid, and the listener is meant to fill it in.
The same word, two attitudes
Va bene.
All right.
Falling: genuine agreement.
Va bene…
Fine, I suppose …
Suspended, bene drawn out: I'll go along, but reluctantly.
Sì.
Yes.
Falling: a full yes.
Sì…
Well, yes …
Suspended: yes, but there's something else.
Certo.
Of course.
Falling: it goes without saying.
Certo…
Sure, sure …
Suspended: I don't quite believe it.
You know the principle from English: "Well …" or "I suppose …" work the same way. In Italian, though, the melody more often carries the whole load, even on a purely positive word like va bene or certo.
Formulas of reservation
A few short phrases are almost always spoken with a suspended ending. They let you hint at doubt or refusal without stating it. Said short and falling, they sound blunt or final instead.
Hinting instead of saying
Beh… non so se è una buona idea.
Well … I'm not sure it's a good idea.
Beh drawn out, with a slight rise: hesitation.
Se lo dici tu…
If you say so …
Polite doubt: I see it differently.
Mah… diciamo di sì…
Hmm … let's say yes …
A yes with a clear reservation.
Insomma…
So-so.
As an answer to Com'era? it means: not great.
In conversation
Chiara
Allora, ti è piaciuto il ristorante?
So, did you like the restaurant?
Davide
Mah… il posto era carino…
Hmm … the place was nice …
Suspended: the food apparently wasn't.
Chiara
Ho capito, non ci torniamo.
Got it, we won't go back.
The melody of politeness
A polite request starts a little higher, uses a wider pitch range and ends softly, as a question. The same words spoken low and flat sound like an order or impatient. A polite Potrebbe … doesn't help much if the melody gives orders.
Asking and addressing
Mi passa il sale, per favore?
Could you pass me the salt, please?
Start higher, end softly.
Potrebbe chiudere la finestra?
Could you close the window?
Scusi…
Excuse me …
Drawn out and slightly rising: I'd like to ask something.