I vores kvarter er fortovet ofte fyldt, når folk går til metroen om morgenen.

This is a location phrase meaning in our neighborhood. Danish often puts this kind of information first to set the scene.

Starting with I vores kvarter gives the sentence this feel:

• As for our neighborhood...
• In our neighborhood...

It is very natural in Danish to begin with place or time information like this.

I is the normal preposition for being in an area, district, neighborhood, city, room, etc.

So:

• i vores kvarter = in our neighborhood
• i København = in Copenhagen
• i huset = in the house

Using på here would not be the normal choice.

Because in Danish, a possessive like min, din, vores, deres usually replaces the article.

So you say:

• vores kvarter = our neighborhood
• not det vores kvarter

This is similar to English: we say our neighborhood, not the our neighborhood.

Not usually in this sentence. In modern everyday Danish, kvarter often means:

• neighborhood
• district
• part of town

So vores kvarter is best understood as our neighborhood here, not literally our quarter.

This is because Danish main clauses follow the V2 rule: the finite verb usually comes in the second position.

Here, the first position is already taken by I vores kvarter, so the verb er must come next:

• I vores kvarter
  • er
    • fortovet ...

If the sentence started with the subject instead, then you would get:

• Fortovet er ofte fyldt ...

Both are possible, but the original sentence emphasizes the location first.

Fortov means sidewalk or pavement.

The ending -et makes it definite singular:

• et fortov = a sidewalk
• fortovet = the sidewalk

So fortovet means the sidewalk.

Because this is the normal word order in a Danish main clause like this.

After the fronted phrase and the finite verb, you often get:

• the subject
• then adverbs like ofte
• then the rest of the sentence

So:

• I vores kvarter
• er
• fortovet
• ofte
• fyldt

That placement sounds natural in Danish.

Fyldt literally means filled or full, but in this sentence it is best understood as:

• crowded
• packed
• full of people

It comes from the verb fylde = to fill, but here it works like an adjective describing the sidewalk.

Danish often uses fyldt when something is full of something specific, even if that thing is not mentioned directly.

So fortovet er fyldt suggests:

• the sidewalk is full
• the sidewalk is filled up
• the sidewalk is crowded

It sounds very natural when talking about space being occupied by people.

Når is used for when in general or repeated situations.

Here the sentence is describing something that happens regularly:

• when people go to the metro in the morning

So når fits well because this is a habitual situation.

A useful contrast:

• når = when, in general / whenever
• da = when, for one specific past event
• hvis = if

Because after a subordinating conjunction like når, Danish usually uses normal subordinate-clause word order.

So you get:

• når folk går til metroen om morgenen

not:

• når går folk ...

Main clauses use the V2 pattern, but subordinate clauses usually do not.

Folk means people in a general sense. It is very common and natural here.

• folk = people in general
• folkene = the people, a specific group
• mennesker = human beings / people, but less idiomatic in this everyday context

So når folk går til metroen means when people go/walk to the metro, not a specific previously mentioned group.

Literally, går means walks/goes on foot.

In this sentence, walk to the metro is a very natural understanding, especially because the sentence is about the sidewalk being crowded.

So folk går til metroen strongly suggests that people are walking to the metro.

Danish often uses metroen as a practical shorthand for:

• the metro system
• the metro entrance
• the metro station people are heading toward

So går til metroen can naturally mean walk to the metro.

If you wanted to be more explicit, you could say:

• går til metrostationen = walk to the metro station

But the original version is completely normal.

Because metro is a common-gender noun in Danish:

• en metro
• metroen = the metro

So the ending -en is the definite singular ending.

Om morgenen is the standard expression for in the morning or in the mornings.

This is a fixed Danish time expression:

• om morgenen = in the morning
• om aftenen = in the evening
• om natten = at night

So the definite form morgenen is normal here.

Also:

• i morges = this morning
• om morgenen = in the morning / in the mornings in general

It is in the present tense:

• er = is
• går = go / walk

Danish often uses the present tense for things that happen regularly or are generally true. This sentence describes a habitual pattern in the neighborhood, not just something happening right now.

So the sense is:

• this often happens
• this is a usual morning situation

Yes, that would also be grammatical.

Compare the emphasis:

• I vores kvarter er fortovet ofte fyldt ...
  Focuses first on the location
• Fortovet er ofte fyldt i vores kvarter ...
  Focuses first on the sidewalk being crowded

Both work, but the original sounds natural because Danish often likes to begin with context such as place or time.