Rommet har tjue stoler.

Rommet is the definite singular form of rom, which means room.

• et rom = a room
• rommet = the room

Norwegian often attaches the definite article to the end of the noun instead of using a separate word like the in English.

Because the sentence is talking about the room, you use rommet.

Because rom is a neuter noun in Norwegian.

For many neuter nouns in Bokmål:

• et rom = a room
• rommet = the room

So the ending -et is the usual definite ending for a singular neuter noun.

Har is the present tense of å ha, which means to have.

• rommet har = the room has

Norwegian often uses å ha in sentences like this to describe what a room, house, or building contains.

So Rommet har tjue stoler is a very natural way to say that the room contains twenty chairs.

Because stoler here means chairs in a general counting sense, not the chairs.

• en stol = a chair
• stoler = chairs
• stolene = the chairs

After a number, Norwegian normally uses the indefinite plural:

• tjue stoler = twenty chairs

So you do not say tjue stolene unless you specifically mean the twenty chairs.

Stoler is the indefinite plural of stol.

The forms are:

• en stol = a chair
• stolen = the chair
• stoler = chairs
• stolene = the chairs

Since the sentence says twenty chairs, the correct form is stoler.

No, this is the normal basic word order for a simple statement in Norwegian:

subject + verb + object

• Rommet = subject
• har = verb
• tjue stoler = object

So the structure is very similar to English:

• The room has twenty chairs

Yes. That is also correct, and it means essentially the same thing:

• Rommet har tjue stoler = The room has twenty chairs
• Det er tjue stoler i rommet = There are twenty chairs in the room

The difference is mainly in perspective:

• Rommet har ... focuses on the room and what it contains.
• Det er ... i rommet focuses on what exists in the room.

Both are natural.

Tjue means twenty.

When using numbers before nouns, Norwegian usually puts the number directly before the plural noun:

• tjue stoler = twenty chairs
• tre bord = three tables
• fem vinduer = five windows

So the pattern is straightforward: number + plural noun.

No. When a noun is counted with a number, you normally do not use en, ei, or et before it.

So you say:

• tjue stoler

not

• en tjue stoler
• et tjue stoler

The number itself already tells you how many there are.

A simple approximation for an English speaker is:

ROM-met har SHOO-eh STOO-ler

A few notes:

• rommet has a short o sound, and the mm is held a bit.
• tjue can vary by dialect, but in standard speech it often sounds something like shoo-eh.
• stoler has stress on the first syllable: STOO-ler.

Pronunciation varies across Norway, so you may hear different versions of tjue especially.

This sentence is Bokmål.

In Nynorsk, you would more likely see:

Rommet har tjue stolar.

The main difference here is the plural of stol:

• Bokmål: stoler
• Nynorsk: stolar

Everything else in the sentence is very similar.