Credo che sia necessario salvaguardare le balene dall'estinzione.

Questions & Answers about Credo che sia necessario salvaguardare le balene dall'estinzione.

Why do we use the subjunctive sia here instead of the indicative è?
The phrase Credo che (I believe that) introduces a personal opinion or thought. In Italian, expressing subjectivity or uncertainty in the main clause triggers the subjunctive mood in the dependent clause, so we use sia (the present subjunctive of essere).
Why isn't there a preposition like di or a before the infinitive salvaguardare?
Impersonal expressions formed with the verb essere plus an adjective, like è necessario (or its subjunctive form sia necessario), are followed directly by the infinitive. You do not need a preposition to link them.
Why does dall'estinzione use the preposition da?
The verb salvaguardare (to safeguard or protect) takes the preposition da to specify what you are protecting something from. Here, da combines with the definite article l' to form the articulated preposition dall'.
What is the difference between using salvaguardare and just saying salvare here?
While both mean to save or protect, salvare usually implies rescuing something from an immediate, active danger. Salvaguardare is more about preserving, defending, and safeguarding something over time, which fits perfectly when talking about protecting a whole species from eventual extinction.

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