Planen blir bestemt på møtet i morgen.

Because planen is the definite singular form: the plan.

In Norwegian, the definite article is usually attached to the noun as an ending:

• en plan = a plan
• planen = the plan

So there is no separate word like English the before the noun here.

Blir bestemt is a passive construction.

It is made from:

• blir = present tense of å bli
• bestemt = past participle of å bestemme

Literally, it is something like gets decided or becomes decided, but in natural English we usually say is decided or will be decided.

So the sentence uses the passive voice: the plan receives the action, instead of someone actively deciding it.

Norwegian very often uses the present tense to talk about the future when there is already a time expression such as i morgen.

So:

• Planen blir bestemt i morgen = natural Norwegian for a future event
• English often translates this as The plan will be decided tomorrow

You could use skal or vil in some contexts, but they add extra meaning:

• skal often suggests intention, arrangement, or obligation
• vil often suggests prediction or willingness

Here, plain blir bestemt is simple and natural because i morgen already shows that the event is in the future.

Because blir bestemt focuses on the action or process of being decided.

• blir bestemt = gets decided / is decided
• er bestemt often describes a state: is already decided, or sometimes is determined

Compare:

• Planen blir bestemt på møtet i morgen = the decision will happen then
• Planen er bestemt = the plan is already decided

So blir is the better choice when you mean the deciding happens at that meeting.

Bestemt is the past participle of å bestemme, which means to decide or to determine.

Here are some useful forms:

• å bestemme = to decide
• bestemmer = decides / is deciding
• bestemte = decided
• bestemt = decided

In this sentence, the past participle is used in the passive construction blir bestemt.

Because på is the normal preposition for being at an event such as a meeting.

So:

• på møtet = at the meeting

This is similar to other event expressions:

• på festen = at the party
• på konserten = at the concert

I møtet can exist, but it usually has a different feel, more like in the meeting or during the meeting, and it is not the most natural choice here.

Because møtet means the meeting, a specific meeting.

The phrase i morgen helps make it feel like a known, particular meeting:

• på møtet i morgen = at the meeting tomorrow

If you said på et møte i morgen, that would mean at a meeting tomorrow, which sounds less specific.

So the sentence is talking about one particular meeting, not just any meeting.

In this sentence, i morgen naturally goes with the whole event and especially with møtet:

• på møtet i morgen = at the meeting tomorrow

So it tells you when the meeting happens, and therefore when the plan will be decided.

A learner can think of the whole phrase på møtet i morgen as one time-and-place expression tied to the decision.

Yes, but the verb must still follow Norwegian V2 word order in main clauses.

For example:

• Planen blir bestemt på møtet i morgen
• I morgen blir planen bestemt på møtet

Both are correct.

Notice that when I morgen comes first, the verb blir must come immediately after it. You cannot say I morgen planen blir bestemt in a normal main clause.

Yes, that is possible.

This uses the -s passive:

• bestemmes = is decided / will be decided

So both of these are possible:

• Planen blir bestemt på møtet i morgen
• Planen bestemmes på møtet i morgen

In many cases, bli + past participle sounds more natural in everyday speech, while the -s passive can feel a bit more formal or written. Both are useful to recognize.