Tutte le finestre sono aperte.

to be

Breakdown of Tutte le finestre sono aperte.

• la finestra: the window
• aperto: open
• tutte: all

Questions & Answers about Tutte le finestre sono aperte.

Why is it tutte and not tutti?

The word tutto (“all”) behaves like an adjective and must agree in gender and number with the noun it modifies. Since finestre is feminine plural, you use the feminine-plural form tutte.

Why do we say le finestre instead of just finestre?

Italian normally requires a definite article before plural, countable nouns in a full sentence. Here le is the feminine plural article (the), so le finestre = “the windows.” English often drops “the” in generic statements, but Italian keeps it.

Could I say Le finestre sono tutte aperte?

Yes. You can place tutte after the verb to stress that all of the windows are open. Both orders are correct:

• Tutte le finestre sono aperte.
• Le finestre sono tutte aperte.

Why is the verb essere used here, not stare?

To describe a state or condition (windows being open), Italian uses the copula essere. While southern or colloquial Italian sometimes uses stare with adjectives, the standard choice for “they are open” is sono aperte.