Soppan är god när den är varm.

Because -n at the end makes the noun definite.

• soppa = soup
• soppan = the soup

Swedish often puts the definite article at the end of the noun instead of using a separate word like the.

So soppan is literally the soup.

In Swedish, the definite article is usually attached to the noun as a suffix.

So instead of:

• English: the soup

you get:

• Swedish: soppan

This is very normal in Swedish:

• en bok = a book
• boken = the book
• en stol = a chair
• stolen = the chair

Because soppa is a common gender noun, not a neuter noun.

In Swedish, singular nouns are usually either:

• en-words (common gender)
• ett-words (neuter)

soppa is an en-word, so when you refer back to it, you use den.

• soppan ... den = correct
• soppan ... det = incorrect

If the noun were neuter, you would use det instead.

Because the sentence has two clauses, and each clause needs its own verb.

• Main clause: Soppan är god
• Subordinate clause: när den är varm

Both clauses describe a state, so both use är.

This is similar to English:

• The soup is tasty when it is warm.

English also repeats is, and Swedish does the same with är.

Yes, but with food and drink, god often means tasty, nice, or delicious.

So in this sentence, god does not just mean morally good or generally good. It specifically means that the soup tastes good.

This is a very common Swedish usage:

• Kakan är god. = The cake is tasty.
• Kaffet är gott. = The coffee tastes good.

A learner often wants to use bra, but bra is usually more like good in a general sense, not specifically about taste.

So:

• god = good/tasty, especially for food and drink
• bra = good in a broader, more general sense

Because adjectives in Swedish often agree with the noun.

Here, soppan refers to soppa, which is:

• singular
• common gender (en-word)

So the adjective stays in its basic common-gender form:

• god

Compare:

• en god soppa = a tasty soup
• soppan är god = the soup is tasty

You would use gott with a singular ett-word:

• ett äpple är gott = an apple is tasty

For the same reason as god: adjective agreement.

The word being described is still den = the soup, and soppa is an en-word. So the adjective is:

• varm

Compare:

• Soppan är varm. = The soup is warm.
• Äpplet är varmt. = The apple is warm.

Since äpple is an ett-word, the adjective becomes varmt.

Here, när means when.

It introduces a subordinate clause:

• när den är varm = when it is warm

In this sentence, it expresses a general condition or situation: the soup is tasty when it is warm.

Depending on context, när can sometimes feel close to when or whenever in English.

Yes, but this sentence uses the normal pattern for a subordinate clause.

After när, Swedish usually keeps the subject before the verb:

• när den är varm

That is:

• när
  • subject
    • verb
      • ...

This is normal subordinate clause word order.

If you start the whole sentence with the när-clause, the main clause changes word order:

• När den är varm, är soppan god.

This happens because Swedish main clauses usually follow the verb-second pattern.

Not with the same meaning.

• Soppan är god ... = The soup is tasty ...
• Soppa är god ... = Soup is tasty ... / Soup is good ... in a general sense

So soppan refers to a specific soup, while soppa without the definite ending sounds more general.

Also, if you use bare soppa in a general statement, you would normally not refer back to it with den in quite the same way unless the structure is adjusted.

Usually varm covers warm and sometimes hot, depending on context.

In this sentence, varm most naturally means the soup is pleasantly warm or hot enough to eat. Swedish often uses varm where English might choose either warm or hot.

If you want to emphasize that something is very hot, Swedish may use other expressions too, depending on context.

So the basic idea is:

• varm = warm / hot

It can be understood either way, but it often sounds like a general truth or a general observation.

The present tense in Swedish is often used for general statements:

• Soppan är god när den är varm.

This can mean something like:

• the soup tastes good when it is warm
• soup is best warm
• this particular soup is good when served warm

The exact interpretation depends on context, but grammatically the sentence is completely natural for a general statement.