Ci potreste comunicare il vostro numero di conto corrente?

English Translation

Could you provide us with your bank account number?

how van you possibly know that it is plural you and not singular you?

In this case it is easy: If the cloze is “potreste” you will see the “vostro” and vice versa.

In many other cases you can’t.
You will encounter this problem regularly (because of the relative simplicity of English grammar).
Then you can add e.g. “plural” as a hint.

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EhilĂ . Potreste is plural You in the Conditional tense. (Potrei, potresti, potrebbe, potremmo, potreste, potrebbero) Hope this helps.