Learn Swedish: Bikupan där det stora bisamhället bor tillhör biodlaren. - The beehive where the large bee colony lives belongs to the beekeeper.

The current lesson is about advanced pseudo-cleft sentences for action focus. How could we rewrite this sentence to emphasize what the bee colony is doing?

To put the focus entirely on the action, you can use a pseudo-cleft structure with Det ... gör är att. For example: Det som det stora bisamhället gör, är att bo i bikupan som tillhör biodlaren (What the large bee colony does, is live in the beehive that belongs to the beekeeper).

Why isn't there a preposition like till after tillhör?

In English, we say that something belongs "to" someone, but the Swedish verb tillhöra already includes that directional meaning. It is a transitive verb that directly takes an object, so you just say tillhör biodlaren (belongs [to] the beekeeper). Adding till here would be grammatically incorrect.

Could I use som instead of där to connect the clauses?

Not on its own. Där means "where", which indicates the location of the action. If you wanted to use the relative pronoun som (which/that), you would have to add a preposition at the end of the relative clause to show location: Bikupan som det stora bisamhället bor i... (The beehive that the large bee colony lives in...).

Let's review the definiteness in det stora bisamhället. Why do we need both det and the -et ending?