Då fyren är gammal, är skenet svagt.

From Lesson 370:Causal clauses (då)·Swedish

Breakdown of Då fyren är gammal, är skenet svagt.

vara
to be
gammal
old
svag
weak
since, because
fyren
the lighthouse
skenet
the glow

Questions & Answers about Då fyren är gammal, är skenet svagt.

Why use here instead of eftersom to mean "since" or "because"?
While eftersom is the most common word for "because" or "since", is also frequently used as a causal conjunction, especially in slightly more formal or written Swedish. They are grammatically interchangeable here, but recognizing and using adds a nice variety to your vocabulary at the B2 level.
Doesn't usually mean "then" or "at that time"? How do I know it means "since" here?
Context is key! While often acts as an adverb meaning "then" (like in vi ses då), it also works as a subordinating conjunction. When it starts a clause in the present tense explaining a reason, like Då fyren är gammal, it almost always means "since" or "because". If the sentence strictly meant "when", a Swede would normally use när.
Why is the word order flipped to är skenet svagt instead of skenet är svagt?
This is the classic V2 (verb-second) rule in action. The entire subordinate clause (Då fyren är gammal) counts as the first "position" or block of information in the main sentence. To keep the main verb in the second position, the verb (är) must come right after the comma, pushing the subject (skenet) to the third position.
Why does the adjective svagt get a -t ending here even though it is placed after the noun?
Adjectives must agree with their noun even when they act as a predicate (coming after verbs like "is" or "becomes"). Because skenet is an ett-word (from ett sken), the base adjective svag must take the neuter -t ending to become svagt.
What kind of light does the word sken refer to?
Ett sken usually translates to a "glow", "gleam", or "shine" rather than a harsh or direct beam of light. Interestingly, it is also used metaphorically in Swedish to mean "appearance" or "illusion", like in the phrase hålla skenet uppe (to keep up appearances).

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