När solen är stark sitter vi helst i skuggan.

När means when. It introduces a time clause:

• När solen är stark = When the sun is strong

In Swedish, när is used for something that happens when/whenever a situation occurs. Here it means something like when the sun is strong / when the sun is shining strongly.

A learner may wonder about om, but om usually means if, not when. So:

• När solen är stark... = when the sun is strong
• Om solen är stark... = if the sun is strong

That changes the meaning.

Solen is the definite form of sol:

• en sol = a sun
• solen = the sun

In Swedish, just like in English, you usually say the sun, not a sun, when talking about the sun in the sky. So solen is the natural choice.

For the same reason: skuggan is the definite form:

• en skugga = a shadow / shade
• skuggan = the shadow / the shade

In this sentence, i skuggan means in the shade. Swedish often uses the definite form in expressions where English also uses the.

So:

• i skuggan = in the shade

This is the normal idiomatic expression.

Yes, stark literally means strong, but in this sentence it is used in the natural Swedish way for sunlight or sun.

So solen är stark means:

• the sun is strong
• the sun is intense
• the sun is bright/hot

In natural English, we might more often say the sun is strong, the sun is intense, or the sun is very bright depending on context.

Because stark is describing solen, and solen is an en-word.

In Swedish adjectives often change form depending on the noun:

• en-sol / solen → stark
• ett-word → starkt

So:

• solen är stark = correct
• solen är starkt = incorrect

Compare:

• Vinden är stark. = The wind is strong.
• Ljuset är starkt. = The light is strong/bright.

Here ljus is an ett-word, so the adjective becomes starkt.

In Swedish, sitta is often used in a broader way than English sit. It can describe being somewhere in a seated, settled, or comfortable position.

So sitter vi helst i skuggan literally means:

• we preferably sit in the shade

But the natural English meaning is often closer to:

• we prefer to sit in the shade
• we usually sit in the shade
• we like to be in the shade

Swedish often uses body-position verbs this way:

• sitta = sit
• stå = stand
• ligga = lie
• hänga = hang

These are used more frequently than in English to describe where something or someone is.

Helst means preferably, rather, or by preference.

So:

• vi sitter helst i skuggan = we prefer to sit in the shade

It shows preference, not obligation.

Some helpful comparisons:

• Jag dricker helst te. = I prefer to drink tea.
• Hon går helst hem tidigt. = She prefers to go home early.

In this sentence, helst tells you what we prefer to do when the sun is strong.

That is normal Swedish word order. In a main clause, the finite verb usually comes in second position. This is the V2 rule.

The sentence structure is:

• När solen är stark = subordinate clause
• sitter = finite verb in second position of the main clause
• vi = subject
• helst = adverb
• i skuggan = prepositional phrase

So after the opening clause, Swedish puts the verb first in the main clause:

• När solen är stark sitter vi helst i skuggan.

If you started with the main clause instead, it would be:

• Vi sitter helst i skuggan när solen är stark.

Both are correct, but when the sentence begins with När solen är stark, the verb sitter must come before vi.

Because the normal Swedish expression is i skuggan, just like English in the shade.

• i = in
• skuggan = the shade

So:

• i skuggan = in the shade

Even though English sometimes uses shade and shadow a bit differently, Swedish skugga can cover this idea naturally in this expression.

Yes. It is a very standard Swedish sentence pattern.

It has two parts:

1. När solen är stark = subordinate clause
2. sitter vi helst i skuggan = main clause

Because the sentence starts with a subordinate clause, the main clause follows the normal verb-second pattern:

• first position: the whole När... clause
• second position: sitter
• then: vi

This is why it is sitter vi, not vi sitter, in this version.

Compare:

• Vi sitter helst i skuggan när solen är stark.
• När solen är stark sitter vi helst i skuggan.

Both are grammatical; the second one emphasizes the time condition first.

Yes, often it can. Swedish skugga covers both ideas more than English does.

Depending on context, skugga can mean:

• a shadow
• shade

In this sentence, i skuggan clearly means in the shade, because it is about avoiding strong sun.

So although the literal noun is the same, the natural English translation here is shade, not shadow.

Yes, absolutely. That is also correct and very natural.

The difference is mostly emphasis:

• När solen är stark sitter vi helst i skuggan.
  Focuses first on the situation: when the sun is strong...

• Vi sitter helst i skuggan när solen är stark.
  Starts with what we do, then adds when.

Both mean the same thing overall. The first version is a good example of Swedish word order after an introductory clause.