Svømmebrillerne ligger stadig i køletasken fra sidste uge.

Because -ne is the definite plural ending in Danish.

• svømmebriller = swimming goggles
• svømmebrillerne = the swimming goggles

This is very common in Danish: instead of using a separate word like the, Danish often adds the definite ending to the noun itself.

A breakdown is:

• svømme = swim / swimming
• briller = glasses / goggles
• svømmebrillerne = the swimming goggles

In Danish, ligge is often used for the location of something, especially when it is seen as lying somewhere.

So:

• Svømmebrillerne ligger i køletasken = the goggles are lying / are in the cooler bag

English often just says are, but Danish prefers verbs like:

• ligge = lie
• stå = stand
• sidde = sit

This is a very natural Danish way to describe where things are.

Stadig means still.

So:

• ligger stadig = are still lying / are still in

Its position here is normal:

• Svømmebrillerne ligger stadig i køletasken

In a main clause, Danish usually puts sentence adverbs like stadig after the finite verb:

• subject + verb + adverb + other information

So this sentence follows a very typical pattern.

Because i means in, and the goggles are inside the cooler bag.

• i køletasken = in the cooler bag
• på køletasken = on the cooler bag

Danish uses i much like English in when something is contained inside something else.

Køletasken is a compound noun plus the definite ending.

It breaks down as:

• køle = cool
• taske = bag
• køletaske = cooler bag / insulated bag
• køletasken = the cooler bag

This is very common in Danish: nouns are often joined together into one word.

Because in time expressions like last week, Danish usually does not use the article den.

So:

• sidste uge = last week
• sidste måned = last month
• sidste år = last year

Using den sidste uge would usually mean something different, more like the last week in a specific sequence or period.

Compare:

• fra sidste uge = from last week
• den sidste uge af ferien = the last week of the vacation

Not here. In this sentence, fra sidste uge most naturally means from last week and describes køletasken:

• køletasken fra sidste uge = the cooler bag from last week

So the idea is that the goggles are still in the cooler bag from last week.

If you wanted to say They have been in the cooler bag since last week, Danish would usually say:

• Svømmebrillerne har ligget i køletasken siden sidste uge.

That is an important difference:

• fra sidste uge = from last week
• siden sidste uge = since last week

Usually, yes, in normal usage it is most often used in the plural, because it refers to a pair of goggles.

• en svømmebrille = one swim goggle lens/unit, or one goggle in a technical sense
• svømmebriller = swimming goggles
• svømmebrillerne = the swimming goggles

This is similar to English words like glasses or goggles, which are often treated as plural.

The sentence follows standard Danish main-clause word order:

• Svømmebrillerne = subject
• ligger = finite verb
• stadig = adverb
• i køletasken fra sidste uge = prepositional phrase

So the pattern is:

• Subject + Verb + Adverb + Place

That is very normal in Danish.

If you move something else to the front, Danish still keeps the verb in second position:

• I køletasken fra sidste uge ligger svømmebrillerne stadig.

That verb-second rule is a key feature of Danish.

Yes, that is a very natural English rendering.

The phrase:

• i køletasken fra sidste uge

can be understood as:

• in the cooler bag from last week
• in last week’s cooler bag

Both are fine in English, and both reflect the Danish structure well.

A learner-friendly approximation would be:

• svømmebrillerne ≈ SVUH-meh-bril-er-neh
• køletasken ≈ KUR-leh-tas-gen or KØ-leh-tas-gen

A few useful points:

• ø is a rounded vowel that English does not really have
• brillerne has a soft, reduced ending
• -sk- in tasken is often pronounced more like sg

Exact pronunciation varies a bit by speaker, but those are the main things to listen for.