Learn Swedish: Den misstänkte ljög i förhöret. Därför är han skyldig. - The suspect lied in the interrogation. Therefore he is guilty.

Misstänkte is a past participle acting as a noun (the suspect). Because we know the suspect is male from the word han (he) in the next sentence, we use the masculine ending -e. If the person were female, or if the gender were unknown, it would typically be den misstänkta.

Why is the word order är han instead of han är in the second sentence?

This is the Swedish V2 (verb-second) rule in action. The adverb Därför (Therefore) takes the first position in the sentence, so the verb är must come second, pushing the subject han to the third position.

What is the infinitive form of ljög?

The infinitive is att ljuga (to lie). It is an irregular verb that changes its vowel, and its forms are ljuger (present), ljög (past), and har ljugit (supine).

How do we know the grammatical gender of the word förhör (interrogation)?

We can tell it is an ett-word because of the definite suffix -et in i förhöret (in the interrogation).

Would the adjective skyldig change if there were multiple suspects?