Question 1

Why is funzioni used here instead of funziona?

Accepted Answer

The phrase è necessario che (it is necessary that) is an impersonal expression that shows necessity. In Italian, these expressions always trigger the subjunctive mood in the following verb. Because funzionare is an -are verb, its he/she/it form in the present subjunctive ends in -i, making it funzioni.

Question 2

Do all phrases starting with 'È + adjective + che' trigger the subjunctive?

Accepted Answer

Most do, especially when they express opinion, necessity, emotion, or doubt, like è importante che or è probabile che. However, if the expression states an absolute certainty or a clear fact, like è certo che (it is certain that) or è vero che (it is true that), you use the normal indicative mood instead.

Question 3

Don't the io and tu forms of -are verbs in the subjunctive also end in -i? How do we know who is doing the action?

Accepted Answer

Yes, in the present subjunctive, the io, tu, and lui/lei forms are all exactly the same! For funzionare, they are all funzioni. Usually, the subject is obvious from the context, just as l'allarme clarifies it here. If it is ever ambiguous, you simply add the subject pronoun before the verb to make it clear.

Question 4

Why do we use bene here instead of buono?

Accepted Answer

Bene is an adverb meaning well, so it describes how the alarm works (the verb funzioni). Buono is an adjective meaning good, which is used to describe nouns. Just like in English, we say the alarm works well, not that it works good.

È necessario che l'allarme funzioni bene.

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