L'ufficio federale è chiuso.

Because ufficio starts with a vowel sound, so the masculine singular definite article il shortens to l' before it.

• il libro = the book
• l'ufficio = the office

This shortening is called elision. In writing, you show it with the apostrophe.

Ufficio is masculine.

That matters because the article and adjective must agree with it:

• l'ufficio
• federale
• chiuso

If the noun were feminine, some forms would change. For example:

• la porta è chiusa = the door is closed

Federale means federal.

It is an adjective, and it agrees with ufficio. The reason it looks the same here is that many Italian adjectives ending in -ale have the same singular form for masculine and feminine:

• ufficio federale = masculine singular
• agenzia federale = feminine singular

But in the plural it changes:

• uffici federali
• agenzie federali

So federale is agreeing; it just happens to have the same singular form for both genders.

È is the third person singular of essere = to be.

So:

• l'ufficio ... è ... = the office ... is ...

The accent on è is important. It distinguishes the verb è from e, which means and.

• è = is
• e = and

Chiuso is the past participle of chiudere = to close.

In Italian, a past participle is often used like an adjective after essere to describe a state:

• La porta è chiusa = The door is closed
• L'ufficio federale è chiuso = The federal office is closed

So here chiuso describes the condition of the office, not the action of closing.

Chiude would mean closes / is closing:

• L'ufficio chiude alle 5 = The office closes at 5

Chiudato is not a correct form.

Because it agrees with ufficio, which is masculine singular.

Agreement works like this:

• masculine singular: chiuso
• feminine singular: chiusa
• masculine plural: chiusi
• feminine plural: chiuse

Examples:

• L'ufficio è chiuso
• La banca è chiusa
• Gli uffici sono chiusi
• Le banche sono chiuse

Yes. In many contexts, chiuso can correspond to English closed or shut.

For a place like an office, shop, or museum, closed is usually the most natural translation:

• L'ufficio è chiuso = The office is closed

For a door or window, English might prefer shut or closed, depending on context:

• La finestra è chiusa = The window is shut / closed

In Italian, many descriptive adjectives commonly come after the noun, especially more factual or classifying adjectives like federale.

So:

• ufficio federale = federal office

Putting federale before the noun would sound unusual in normal Italian.

Also, chiuso comes after è because it is part of the predicate:

• L'ufficio federale è chiuso

Yes, absolutely. That means The federal office is closed today.

You can easily add time expressions:

• L'ufficio federale è chiuso oggi
• L'ufficio federale è chiuso il lunedì
• L'ufficio federale è chiuso per ferie

The core sentence stays the same.

A simple pronunciation guide is:

loof-FEE-cho feh-deh-RAH-leh eh kee-OO-zoh

A few helpful points:

• ufficio has stress on -fi-: uf-FI-cio
• ci before o sounds like cho in English chocolate
• chiuso begins with chi, which sounds like kee, not chee
• è is pronounced like eh

If you say it smoothly, the beginning sounds connected:

• L'ufficio ≈ lufficio

Usually it describes a state at the moment or for a certain period of time: the office is not open.

So in most situations, it means:

• the office is currently closed
• or it is closed on a certain day/time

Italian often uses essere + past participle/adjective for this kind of state:

• Il negozio è aperto = The shop is open
• Il negozio è chiuso = The shop is closed

Context tells you whether it is temporary, habitual, or scheduled.

Yes.

Here is how each part changes:

• l'ufficio → gli uffici
• federale → federali
• è → sono
• chiuso → chiusi

So:

• L'ufficio federale è chiuso = singular
• Gli uffici federali sono chiusi = plural

This is a very useful example of Italian agreement across the whole sentence.