اتفقنا.

In اتفقنا, -نا is the built-in subject ending meaning we in the past/perfect tense.

So اتفقنا already includes the subject:

• اتفقنا = we agreed

You do not need to add نحن unless you want extra emphasis:

• نحن اتفقنا = we agreed

Yes. Grammatically, اتفقنا is the perfect form of the verb, which often corresponds to the English past.

Depending on context, it can mean:

• we agreed
• we have agreed
• simply agreed

As a short standalone reply, it can also feel like it’s agreed or deal.

In careful MSA pronunciation, it is ittafaqnā.

The fully vowelled form is:

• اتَّفَقْنا

A rough breakdown:

• i at the beginning
• tt because the ت is doubled
• faq
• nā with a long ā

Because ordinary Arabic writing usually leaves out most short vowels and other pronunciation marks.

So you normally see:

• اتفقنا

But the fully marked form is:

• اتَّفَقْنا

The missing marks include:

• the initial short i
• the shadda on ت showing it is doubled
• the sukūn on ق
• the short a vowels inside the word

The dictionary form is:

• اتَّفَقَ

Its root is:

• و-ف-ق

This root is connected with ideas like agreement, accord, and suitability.

A common related noun is:

• اتفاق = agreement

Because Arabic verbs usually include the subject inside the verb itself.

In اتفقنا, the ending -نا already tells you the subject is we. That is why اتفقنا is a complete sentence by itself.

This is very normal in Arabic.

Because the topic can be understood from context.

As a short sentence, اتفقنا can stand alone if both speakers already know what they are agreeing about.

If you want to say the full idea, Arabic often uses:

• اتفقنا على الموعد = we agreed on the time/date
• اتفقنا أن نبدأ مبكرًا = we agreed to start early / agreed that we would start early

So اتفقنا by itself is like saying agreed when the rest is already obvious.

Yes. It is completely natural in MSA.

It is especially common when:

• confirming that an agreement has been reached
• closing a discussion
• accepting a plan or arrangement

It is also widely used in spoken Arabic varieties, often with the practical sense of okay, agreed or deal.

They are related, but not identical.

• اتفقنا usually means we came to an agreement together
• وافقنا often means we approved, we consented, or we agreed with something/someone

So اتفقنا focuses more on mutual agreement, while وافقنا often focuses more on approval or consent.

The first ا here is part of همزة الوصل.

When you start speaking with this word, you pronounce a helping vowel, so it begins as i-, giving ittafaqnā.

In other words:

• written: اتفقنا
• pronounced at the beginning of speech: ittafaqnā

This is a normal feature of Arabic pronunciation and spelling.