Learn Italian: La decisione deve essere confermata da parte del portavoce. - The decision must be confirmed by the spokesperson.

While dal portavoce is perfectly correct, using the phrase da parte di (combined with il to make del) emphasizes the spokesperson's official or institutional role. It is frequently used in formal, journalistic, or administrative contexts to stress the authority behind the action.

Why does confermata end in -a if there is a modal verb (deve) before it?

In the passive voice, the past participle always agrees with the subject in gender and number, regardless of whether a modal verb is used. Since the subject la decisione is feminine singular, the participle must be confermata.

How does the word portavoce work, and what is its plural form?

Portavoce is a compound noun made of a verb (porta, meaning carries) and a noun (voce, meaning voice). Nouns formed this way referring to people keep the same ending in both singular and plural forms. Its gender matches the person it refers to. Here, the article del shows this is a male spokesperson. In the plural, you only change the article: i portavoce or le portavoce.

Could we use venire to form this passive sentence, like deve venire confermata?