Við förum að borða núna.

Fara is the dictionary form, meaning to go.
Förum is the 1st person plural present tense form, so it means we go / we are going.

So:

• ég fer = I go
• þú ferð = you go
• við förum = we go

Because the subject is við (we), the verb has to match it, so förum is the correct form.

Here, að is the infinitive marker, like English to in to eat.

So:

• borða = eat / to eat
• að borða = to eat

In this sentence, að borða goes with förum as part of the expression fara að + infinitive.

This is a very common Icelandic structure. Fara að + infinitive usually means:

• to start doing something
• to be about to do something
• sometimes simply to go and do something, depending on context

So Við förum að borða núna is not mainly about physically going somewhere. It usually means something like:

• We’re going to eat now
• We’re about to eat now
• We’re starting to eat now

English speakers often first assume fara keeps its literal meaning go, but in this pattern it often works more like start/begin/be about to.

It is often a very good translation, but the grammar is not exactly the same as in English.

In English, be going to eat often means a future action.
In Icelandic, fara að borða often gives the sense of starting or about to begin eating.

So the overall meaning is very close, but the Icelandic expression can feel a bit more like:

• We’re about to start eating now

rather than a neutral future statement far off in time.

Because it is in the infinitive after að.

In the construction fara að + infinitive, the second verb stays in its basic infinitive form:

• að borða = to eat
• að sofa = to sleep
• að læra = to study

Only the first verb, here förum, is conjugated to match the subject.

Núna means now.

It tells you the time of the action and emphasizes that it is happening right now or at this moment.

So:

• Við förum að borða. = We’re going to eat.
• Við förum að borða núna. = We’re going to eat now.

It makes the sentence sound more immediate.

Yes, Icelandic word order is somewhat flexible, especially with adverbs like núna.

The version you have:

• Við förum að borða núna.

is very natural and neutral.

You may also see:

• Núna förum við að borða.

This puts more emphasis on now.

But the original sentence is probably the most straightforward choice for a learner.

Normally, við is necessary.

Icelandic usually does not drop the subject pronoun the way Spanish or Italian often can. So if you mean we, you normally say við.

That means:

• Við förum að borða núna. = natural
• Förum að borða núna. = this could sound more like Let’s start eating now in the right context, or like part of a different structure, not simply a normal omitted-subject statement

So if you want the plain meaning We are going to eat now, keeping við is the safe choice.

In við, the ð is a soft sound, somewhat like the th in English this, though in actual Icelandic speech it can be weaker depending on position and speaker.

A rough guide:

• Við sounds approximately like vith or vidh

But pronunciation in Icelandic is not always obvious from English spelling, so it is best to hear native audio if possible.

Also, note that við here means we, not the preposition with, even though the spelling is the same. Context tells you which meaning it has.

This is a very useful distinction.

• Við borðum núna = We are eating now / We eat now
• Við förum að borða núna = We are going to eat now / We are about to start eating now

So:

• borðum focuses more on the action itself already happening
• förum að borða focuses more on the beginning or immediate start of the action

If everyone is just sitting down and about to begin the meal, Við förum að borða núna fits very well.

Formally, förum is present tense.

However, just like in many languages, the present tense can refer to something that is about to happen very soon. In this sentence, the meaning is future-oriented in a very immediate way:

• We’re going to eat now
• We’re about to eat now

So the verb form is present, but the overall sense points to the near future or the immediate start of an action.