Learn Hardcore Italian: Il sistema funziona bene.

Because sistema is a masculine singular noun. In Italian, the definite article “the” translates to il for masculine singular nouns beginning with a consonant. So il sistema means “the system.”

What does funziona mean and why is it in this form?

funziona is the third-person singular present indicative of the verb funzionare, which means “to work” or “to function.” Since il sistema (the subject) is third-person singular, the verb agrees by becoming funziona (“it works”/“it functions”).

Why is bene used here and what is its function?

bene is an adverb meaning “well.” It modifies the verb funziona to specify how the system works: Il sistema funziona bene = “The system works well.”

Can I move bene to a different position in the sentence?

Adverbs of manner like bene typically follow the verb in Italian. Putting bene before the verb (for example, Il sistema bene funziona) sounds unnatural. The correct order is Il sistema funziona bene.

Could I say Il sistema funziona buono instead of bene?

No. buono is an adjective meaning “good” and must agree with a noun (e.g., un buon sistema = “a good system”). To modify a verb, you need the adverb bene, not the adjective buono.

Is funzionare used only for machines and systems?

Not only. funzionare can describe anything that works or functions properly, for example:

La lavatrice funziona (“The washing machine works”)
Il piano funziona (“The plan functions”)
La strategia funziona (“The strategy works”)
You wouldn’t normally use it for a person’s job performance.

What’s the literal versus the idiomatic translation?

Literal: “The system functions well.”
Idiomatic/Natural: “The system works well.”

Why is there no preposition before bene?

Adverbs in Italian stand alone and do not require prepositions. bene directly modifies the verb without any added word.