Har vi tillräckligt med stolar till alla gäster?

Because this is a yes/no question in Swedish.

• Vi har tillräckligt med stolar ... = We have enough chairs ...
• Har vi tillräckligt med stolar ...? = Do we have enough chairs ...?

In main clauses, Swedish usually forms yes/no questions by putting the verb first:

• Kommer du? = Are you coming?
• Kan han svenska? = Can he speak Swedish?

So Har vi ...? is the normal question word order.

Tillräckligt means enough / sufficiently.

In this sentence, it is part of the fixed expression:

• tillräckligt med + noun = enough + noun

So:

• tillräckligt med stolar = enough chairs

It is not acting like a regular adjective directly before the noun, so you do not say tillräckliga med stolar here.

Compare:

• Vi har tillräckligt med stolar. = We have enough chairs.
• Stolarna är tillräckliga. = The chairs are sufficient.

In the second example, tillräckliga is a normal adjective agreeing with the plural noun.

In Swedish, enough before a noun is commonly expressed as:

• tillräckligt med + noun

So med is a normal and expected part of the structure.

Examples:

• tillräckligt med pengar = enough money
• tillräckligt med tid = enough time
• tillräckligt med folk = enough people

English does not need a word like med here, but Swedish usually does.

Because the sentence means enough chairs, not the chairs.

• stolar = chairs (indefinite plural)
• stolarna = the chairs (definite plural)

When talking about quantity in a general way, Swedish often uses the indefinite plural:

• Vi har många stolar. = We have many chairs.
• Vi har tillräckligt med stolar. = We have enough chairs.

If you said stolarna, it would sound like you mean a specific known set of chairs.

Here till means something like for / enough for / to cover the needs of.

So:

• till alla gäster = for all the guests

This is very natural in Swedish after words about quantity or sufficiency:

• Det finns kaffe till alla. = There is coffee for everyone.
• Har vi mat till barnen? = Do we have food for the children?

You may sometimes see för in other contexts, but in this sentence till is the natural choice.

Both can exist in Swedish, but they are used a little differently.

• alla gäster = all guests / all the guests
• alla gästerna = all the guests

In many contexts, alla + plural noun can already mean all the ..., especially when the group is understood from the situation.

So in a sentence like this, alla gäster sounds completely natural.

Compare:

• Alla gäster kom i tid. = All the guests arrived on time.
• Alla gästerna kom i tid. = also All the guests arrived on time.

The version without -na is often a bit lighter and very common.

Yes, very natural.

It sounds like normal spoken or written Swedish when someone is checking whether there are enough chairs for a group.

Other natural alternatives include:

• Har vi nog med stolar till alla gäster?
• Finns det tillräckligt med stolar till alla gäster?

All of these are idiomatic, but your sentence is perfectly standard.

Both can mean enough.

• tillräckligt med is a bit more neutral or formal
• nog med is often a bit more conversational

Examples:

• Vi har tillräckligt med stolar.
• Vi har nog med stolar.

Both mean We have enough chairs.

In your sentence, either works, but tillräckligt med may sound slightly more careful or explicit.

Yes. In practice, it often can.

Swedish does not always mark definiteness in exactly the same way English does. In context, alla gäster often naturally refers to the specific guests being discussed.

So if you are preparing for a party and ask:

• Har vi tillräckligt med stolar till alla gäster?

everyone understands that you mean the guests who are coming.

A careful approximation is:

Har vi till-räck-lit med STO-lar till AL-la YES-ter?

A few notes:

• Har vi often sounds smooth and connected in speech.
• tillräckligt has the main stress on räck.
• stolar has stress on the first syllable: STO-lar
• gäster also has stress on the first syllable: YES-ter (with gä sounding somewhat like the ye in yes, but with a Swedish vowel quality)

If you want to sound natural, focus especially on the stress pattern rather than pronouncing every letter very strongly.

Yes, absolutely.

That version means:

• Is there/Are there enough chairs for all the guests?

The difference is mainly perspective:

• Har vi tillräckligt med stolar ...? = focuses on what we have
• Finns det tillräckligt med stolar ...? = focuses on whether enough chairs exist/are available

Both are natural, and the choice depends on what you want to emphasize.

The main thing is the beginning: Har vi for a yes/no question.

After that, the rest is straightforward:

• Har = have
• vi = we
• tillräckligt med stolar = enough chairs
• till alla gäster = for all the guests

So the structure is basically:

• Verb + subject + quantity expression + purpose/recipient

This is very common in Swedish question sentences.