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in sein

in his

→ in
phrase Very common #866
in his Usually followed by a noun; sein changes form to match the noun's gender and case, as in seinem Zimmer.
GE: Er arbeitet in seinem Büro.
EN: He works in his office.

Jeffrey Jeffson konnte entkommen, nur in sein Bettlaken gehüllt.

Jeffrey Jeffson managed to escape wearing nothing but his bedsheet.

Er ist in sein Lehrer verliebt.

He is in love with his teacher.

Jeder macht sein Ding in sein Umfeld.

Everyone does their own thing in their own environment.

— Die Samurai der Moderne - Die dunkle Seite (2004)

Mein Vater schreibt jeden Tag in sein Tagebuch.

My father writes in his diary every day.

Tom ging hinauf in sein Schlafzimmer.

Tom went up to his bedroom.

Was Rohit wohl in sein schwarzes Tagebuch schrieb?

What did Rohit probably write in his black diary?

— Indian Love Story - Kal Ho Naa Ho (2003)

Er schrieb seine Gedanken in sein Notizbuch nieder.

He wrote down his thoughts in his notebook.

Was, wenn er das, was er sah, in sein Tagebuch geschrieben hat?

What if he wrote down what he saw in his diary?

— Harry Potter und die Kammer des Schreckens (2002)

Yanni ging in sein Schlafzimmer.

Yanni went into his bedroom.