Learn Swedish: Kanske den hemlösa katten gömmer sig under soffan. - Maybe the homeless cat is hiding under the sofa.

The word kanske is a famous exception to the Swedish V2 rule. When a main clause starts with kanske, you can put the subject (den hemlösa katten) before the verb (gömmer), creating a V3 word order. This is incredibly common in everyday Swedish.

Could we move kanske to a different spot in the sentence?

Yes, you can put it in the standard sentence adverb position, which is right after the verb in a main clause. The sentence would then be Den hemlösa katten gömmer sig kanske under soffan. Placing it at the very beginning just highlights the uncertainty a bit more.

Why is it den hemlösa katten and not just den hemlös katten?

This is the Swedish double definite construction. When you add an adjective to a specific, definite noun, you need three pieces: the freestanding article (den), the adjective with its definite -a ending (hemlösa), and the definite suffix on the noun itself (katten).

Why is sig necessary here? Doesn't gömmer already mean hiding?

The verb gömma needs a direct object. It means to hide something. If the cat were hiding a toy, you would just say katten gömmer leksaken. Because the cat is hiding itself, the verb must be reflexive, so we use gömmer sig.