Jordbærene og druene ligger i kjølebagen ved døren.

Because both nouns are in the definite plural form: the strawberries and the grapes.

Here are the basic forms:

• et jordbær = a strawberry
• jordbær = strawberries
• jordbærene = the strawberries

and

• en/ei drue = a grape
• druer = grapes
• druene = the grapes

So the -ene ending is a very common Bokmål ending for definite plural nouns.

In Norwegian, definiteness is usually shown by adding an ending to the noun, instead of putting a separate word like English the in front.

So:

• jordbærene already means the strawberries
• druene already means the grapes
• kjølebagen already means the cooler bag
• døren already means the door

This is one of the biggest differences from English. In many everyday sentences, Norwegian puts the at the end of the noun.

Norwegian often uses ligge when talking about where things are physically located, especially when they are lying somewhere or resting in a place.

So:

• ligger i kjølebagen = are lying in the cooler bag

This sounds more natural than er i kjølebagen in a sentence like this.

A useful rough guide is:

• er = is/are for identity, description, or very general existence
• ligger = lies / is located / is resting
• står = stands / is standing
• sitter = sits / is sitting

Norwegian uses these positional verbs more often than English does.

Because Norwegian verbs do not change for singular and plural subjects in the present tense.

So:

• Jordbæret ligger = The strawberry is lying
• Jordbærene ligger = The strawberries are lying

The verb stays ligger either way.

This is much simpler than English, where you have is versus are.

Kjølebagen is the definite singular form of en kjølebag.

So:

• en kjølebag = a cooler bag / insulated bag
• kjølebagen = the cooler bag

It is also a compound noun, which is very common in Norwegian:

• kjøle- = related to cooling
• bag = bag

Put together: kjølebag.

Norwegian makes compound nouns very freely, often more freely than English.

Because the sentence uses two different prepositions for two different relationships:

• i = in / inside
• ved = by / near / next to

So:

• i kjølebagen means the strawberries and grapes are inside the cooler bag
• ved døren means that this cooler bag is by the door

A natural way to understand the whole sentence is:

• The strawberries and the grapes are in the cooler bag, and the cooler bag is by the door.

Both can be correct in Bokmål.

The noun dør can be treated as:

• en dør → døren
• ei dør → døra

So both of these are possible:

• ved døren
• ved døra

The version with -en is often a bit more neutral or formal-looking in written Bokmål, while -a is also very common and often feels more everyday or dialect-friendly.

Yes. This is the normal basic order:

• subject + verb + other information

So here:

• Jordbærene og druene = subject
• ligger = verb
• i kjølebagen ved døren = location information

Norwegian is a verb-second language, which means the finite verb normally comes in the second position in main clauses.

If you move something else to the front, the verb still stays second:

• Ved døren ligger jordbærene og druene i kjølebagen.

That is also grammatical, but the emphasis changes.

In practice, it describes the location of the whole situation, but the most natural interpretation is that the cooler bag is by the door.

Since the fruit are in the cooler bag, and the bag is by the door, the fruit are also by the door indirectly.

So the sentence is most naturally understood as:

• the strawberries and grapes are inside a cooler bag
• that cooler bag is located by the door

A few parts are especially tricky for English speakers:

• kj in kjølebagen
  This is a soft sound that does not match normal English exactly. In many dialects it sounds somewhat like a very soft h mixed with sh, but farther forward in the mouth.

• ø in kjølebagen and døren
  This vowel does not exist in standard English. It is a rounded front vowel. You have to round your lips more than for English uh.

• jordbærene
  The j is pronounced like English y.
  So the beginning sounds roughly like yor-.

A very rough learner-friendly approximation might be:

• jordbærene ≈ YOR-beh-re-ne
• druene ≈ DROO-eh-ne
• kjølebagen ≈ something like HYUH-leh-bah-gen or SHYUH-leh-bah-gen, depending on how close you get to kj
• døren ≈ roughly DUR-en, but with a rounded ø

Those approximations are not exact, but they can help you get started.

Yes, but it would mean something slightly different.

Compare:

• Jordbærene og druene ligger i kjølebagen ved døren.
  = specific strawberries, specific grapes, and a specific cooler bag

• Jordbær og druer ligger i en kjølebag ved døren.
  = strawberries and grapes are in a cooler bag by the door, more indefinite and less specific

So the original sentence sounds like the speaker and listener already know which fruit and which bag are being talked about.