Questions & Answers about Pappan läser sin bok i huset.
Why do we use sin here instead of hans?
In this sentence, Pappan is the subject. When a third-person subject (like he, she, it, or they) interacts with their own belongings, Swedish uses a reflexive pronoun like sin. If you said Pappan läser hans bok, it would mean the father is reading another man's book.
Why is the form sin used instead of sitt or sina?
The reflexive pronoun has to match the gender and number of the noun being owned, not the owner! Since bok is a singular en-word, we use sin. If the father was reading a letter (an ett-word, ett brev), we would use sitt brev, and if he read multiple books, it would be sina böcker.
Why is the word just bok and not boken?
In Swedish, whenever you use a possessive pronoun (like min, din, hans, or sin), the noun that follows must be in the indefinite form. You drop the definite ending, so it is always sin bok, never sin boken.
Why does huset end in -et but Pappan ends in -n?