Induljunk most, különben késni fogunk.

Because induljunk is the 1st person plural imperative/subjunctive form of indul (to set off, to depart, to start going).

In Hungarian, the form meaning let's ... is built with the imperative/subjunctive ending. So:

• indul = he/she/it leaves, sets off
• induljunk = let's leave / let's set off

This is a very common pattern:

• menjünk = let's go
• nézzük = let's see / let's watch
• kezdjük = let's begin

So Induljunk most literally means something like Let us set off now.

Hungarian grammar usually groups these together because they use the same set of forms. In English, we separate ideas like:

• Go! (imperative)
• Let's go (hortative)
• I want him to go / so that he go (subjunctive-like ideas)

In Hungarian, these are expressed with the same general mood category, often called the imperative/subjunctive.

So in this sentence, induljunk is not a command to you plural. It is a suggestion including the speaker: let's leave.

Not exactly.

• menni = to go
• indulni = to set off, depart, start out

So induljunk suggests starting the journey/movement now, not just going in a general sense.

Compare:

• Menjünk most. = Let's go now.
• Induljunk most. = Let's leave/set off now.

In many contexts, both could work, but induljunk has a stronger sense of getting started.

Hungarian word order is flexible and often reflects focus or emphasis rather than fixed grammatical position.

• Induljunk most = Let's leave now
• Most induljunk is possible only in a special contrastive context, for example if you mean Let's leave now, not later

In a neutral sentence, Induljunk most sounds natural. The verb often comes first in suggestions like this.

So the position of most here is normal and natural, even though English usually puts now after the verb too.

Különben means otherwise, or else, or sometimes if not depending on context.

In this sentence:

• Induljunk most, különben késni fogunk.
• Let's leave now, otherwise we'll be late.

It introduces the negative consequence of not doing the first action.

Very similar examples:

• Siess, különben lekésed a buszt. = Hurry, otherwise you'll miss the bus.
• Tanulj, különben megbuksz. = Study, otherwise you'll fail.

Hungarian often uses fog + infinitive to express the future.

Here:

• fogunk = we will
• késni = to be late

So:

• késni fogunk = we will be late

The verb fog originally means to hold, catch, but in this structure it functions like a future marker.

Breakdown:

• fogok = I will
• fogsz = you will
• fog = he/she/it will
• fogunk = we will
• fogtok = you plural will
• fognak = they will

Then you add the infinitive:

• menni fogok = I will go
• késni fogunk = we will be late

Because in the fog + infinitive future construction, the main verb stays in the infinitive, and fog carries the person/number marking.

So:

• késni fogok = I will be late
• késni fogsz = you will be late
• késni fogunk = we will be late

The conjugation appears on fog, not on késni.

This is similar to English will be late, where will changes for tense/function, and the main verb stays in a basic form.

Yes, often it could.

Hungarian frequently uses the present tense to talk about the future when the meaning is clear from context.

So these can both work:

• különben késünk = otherwise we're late / we'll be late
• különben késni fogunk = otherwise we'll be late

The version with fogunk makes the future meaning more explicit. In this sentence, it sounds perfectly natural.

Yes. késni means to be late or to arrive late.

Examples:

• Kések. = I am late.
• El fogok késni. = I will be late.
• Ne késs! = Don't be late!

So késni fogunk means we will be late.

Both can often be translated as we will be late, but there is a nuance.

• késni fogunk = we will be late
• el fogunk késni = we will end up being late / we will arrive late

The prefix el- often gives a sense of ending up in that state or missing the intended timing.

In everyday speech, elkésünk / el fogunk késni is very common when talking about arriving late somewhere. But késni fogunk is also correct and understandable.

It comes from:

• indul- = verb stem
• -junk / -jünk = 1st person plural imperative/subjunctive ending

Because indul contains back vowels (u), it takes the back-vowel version -junk.

So:

• indul + junk = induljunk

This is due to vowel harmony, a major feature of Hungarian.

Compare:

• marad → maradjunk = let's stay
• ül → üljünk = let's sit
• menni is irregular here: menjünk = let's go

A natural reading would be something like:

• Induljunk most, különben késni fogunk.

The sentence has two parts:

1. Induljunk most — the suggestion
2. különben késni fogunk — the consequence

The stress often falls naturally on the important content words, especially induljunk, most, különben, and késni.

If you want extra emphasis on now, you could stress most more strongly, like:

• Induljunk MOST, különben késni fogunk.

That gives the sense of now, not later.