Vi er vant til at høre støj fra gaden om aftenen.

At være vant til means to be used to or to be accustomed to.

So:

Vi er vant til at høre støj fra gaden om aftenen
= We are used to hearing noise from the street in the evening / in the evenings

A very important point for English speakers: this is used to in the sense of being accustomed to something, not used to in the sense of a past habit.

Because vant til is a fixed expression.

The pattern is:

• være vant til + noun
• være vant til at + verb

Examples:

• Jeg er vant til kulde. = I am used to cold.
• Jeg er vant til at stå tidligt op. = I am used to getting up early.

So in your sentence, til at høre is completely normal Danish after vant.

After vant til, Danish normally uses at + infinitive when a verb follows:

• vant til at høre
• vant til at arbejde
• vant til at vente

English often uses a gerund after to be used to:

• used to hearing
• used to working
• used to waiting

So this is one of those places where Danish and English express the same idea with different grammar.

No. English used to has two different meanings, and Danish uses different expressions for them.

1. Be used to = be accustomed to

   • Danish: være vant til

2. Used to do = did something regularly in the past

   • Danish: often plejede at

Compare:

• Jeg er vant til at stå tidligt op.
  = I am used to getting up early.

• Jeg plejede at stå tidligt op.
  = I used to get up early.

Your sentence uses the first meaning: being accustomed to something.

Because høre means hear, while lytte means listen.

• høre = to hear, to perceive sound
• lytte (til) = to listen, to pay attention to sound

In this sentence, the idea is that the noise reaches you; you do not actively choose to listen to it. So høre støj is the natural choice.

• Vi er vant til at høre støj... = We are used to hearing noise...
• Vi lytter til musik. = We listen to music.

It means noise from the street.

• støj = noise
• fra = from
• gaden = the street

So støj fra gaden could mean traffic noise, people talking, cars, bicycles, buses, nightlife, and so on.

Also note that Danish often uses the definite form where English might or might not:

• gaden = the street

Because gaden is the definite form, meaning the street.

In Danish, the definite article is often attached to the end of the noun:

• en gade = a street
• gaden = the street

So:

• støj fra gaden = noise from the street

That is the normal way to say it here.

Om aftenen means in the evening or, very often in a sentence like this, in the evenings.

This expression is commonly used for something general, repeated, or typical:

• om morgenen = in the morning
• om eftermiddagen = in the afternoon
• om aftenen = in the evening / in the evenings
• om natten = at night / during the night

Because your sentence is about what people are accustomed to, om aftenen sounds habitual: it suggests this is something that normally happens in the evening.

This is a very common question.

• om aftenen = in the evening / in the evenings, generally or habitually
• i aften = tonight, this evening

So:

• Vi er vant til at høre støj fra gaden om aftenen.
  = We are used to hearing noise from the street in the evening / in the evenings.

• Vi kommer til at høre støj fra gaden i aften.
  = We are going to hear noise from the street tonight.

Your sentence uses om aftenen because it describes a general situation, not one specific evening.

Yes. Danish word order allows some flexibility with time expressions.

The sentence you have is very natural:

• Vi er vant til at høre støj fra gaden om aftenen.

But you could also say:

• Om aftenen er vi vant til at høre støj fra gaden.

That gives om aftenen more emphasis.

For learners, the original version is a very good neutral word order: subject first, then verb, then the rest, with the time phrase at the end.

Yes, you can.

• Vi er vant til at høre støj fra gaden om aftenen.
• Vi er vant til støj fra gaden om aftenen.

Both are correct, but they are slightly different in focus:

• vant til at høre støj focuses on the experience of hearing it
• vant til støj focuses more directly on the noise itself

In everyday Danish, both are possible.

Vi means we, and er is the present tense of at være = to be.

So:

• jeg er = I am
• du er = you are
• han/hun er = he/she is
• vi er = we are
• I er = you are
• de er = they are

Since the sentence describes a present state, Danish uses er:

• Vi er vant til... = We are used to...

Most likely many evenings or a general evening situation.

That comes from two things:

1. er vant til describes a general state
2. om aftenen usually has a habitual or general meaning

So the sentence normally suggests something like:

We are used to hearing street noise in the evenings.

Even though English may sometimes translate it as in the evening, the sense is usually repeated or typical, not a one-time event.