Firmiamo l'atto oggi.

Firmiamo is the 1st person plural form of firmare (to sign) in the present indicative.

So it can mean:

• we sign
• we are signing

Depending on context, Italian often uses the simple present where English might use either we sign or we are signing.

It can also sometimes sound like let's sign, but that is usually understood from context rather than being a separate form.

Italian often drops subject pronouns when they are not needed.

In firmiamo, the ending -iamo already tells you the subject is we. So:

• Firmiamo l'atto oggi. = We’re signing the document today.
• Noi firmiamo l'atto oggi. = also correct, but noi adds emphasis, like we are the ones signing it.

This is very common in Italian.

Because atto starts with a vowel, the definite article il becomes l' before it:

• il libro
• l'atto

This shortening is called elision. It happens with many singular nouns that begin with a vowel.

So:

• l'atto = the act / the deed / the document

In everyday Italian, atto can mean several things depending on context. In this sentence, it usually means a formal or legal document, such as:

• a deed
• an official document
• a legal act/instrument

So Firmiamo l'atto oggi often sounds like something said in a legal, administrative, or official situation.

Putting oggi at the end is completely natural in Italian.

• Firmiamo l'atto oggi.
• Oggi firmiamo l'atto.

Both are correct.

The difference is mainly focus:

• Firmiamo l'atto oggi. → neutral, with today added at the end
• Oggi firmiamo l'atto. → emphasizes today

Italian word order is often more flexible than English word order.

Yes, it can, depending on context.

The form firmiamo is formally the present tense, but in real usage it can sometimes function like a suggestion:

• Firmiamo l'atto oggi? = Shall we sign the document today?
• Firmiamo l'atto oggi. = could mean We’re signing the document today or, in the right situation, Let’s sign the document today

If you want a clearer suggestion, intonation or punctuation usually helps.

Italian very often uses the present tense to talk about a planned future action, especially when a time expression makes the timing clear.

So:

• Firmiamo l'atto oggi. = We’re signing the document today
• Domani partiamo. = We’re leaving tomorrow

You could also use the future:

• Firmeremo l'atto oggi is usually not natural because oggi already refers to today, not future from today’s point of view.
• More natural future example: Firmeremo l'atto domani. = We will sign the document tomorrow

A simple pronunciation guide is:

feer-MYAH-mo LAHT-to OD-jee

A few points:

• fir- sounds like feer
• -miamo has the stress on -mia-: myAH
• l'atto has a clear doubled tt sound: AHT-to
• oggi sounds like OD-jee, with gg like the j sound in judge

The infinitive is firmare, which means to sign.

A few present-tense forms are:

• io firmo = I sign / I am signing
• tu firmi = you sign
• lui/lei firma = he/she signs
• noi firmiamo = we sign
• voi firmate = you all sign
• loro firmano = they sign

So firmiamo is the noi form.

No, it would not be wrong. It is grammatically correct.

But in normal Italian, noi is often omitted unless you want to:

• emphasize the subject
• contrast it with someone else

For example:

• Loro aspettano, noi firmiamo l'atto oggi.
  They’re waiting; we’re signing the document today.

Without special emphasis, Firmiamo l'atto oggi sounds more natural.