Learn Swedish: Han lägger järnet på städet så att han kan smida det platt. - He puts the iron on the anvil so that he can forge it flat.

The word platt describes the final state of the object (det, referring to järnet) after the action is completed. Because järnet is an ett-word, the adjective must agree with it. However, adjectives that already end in a double -tt, like platt or trött, do not add another -t in the neuter form, so it remains platt.

Why do we use lägger instead of other verbs for "put" like sätter or ställer?

Swedish placement verbs depend on the physical position of the object. Lägger is used for placing things horizontally or laying them down. Since the iron is placed flat onto the anvil to be hammered, lägger is the natural choice. If you were standing an object upright, you would use ställer.

In the clause så att han kan smida det platt, where would an adverb like inte go?

The phrase så att introduces a subordinate clause, which means the BIFF rule applies. This dictates that sentence adverbs come before the first verb. If you wanted to say "so that he cannot forge it flat", the inte must come right before kan, making it så att han inte kan smida det platt.

Why do we use det in the second clause instead of ?