into
The German word 'in' is used to express movement or direction into something. It is often used with the accusative case in German. For example, 'Ich gehe in die Schule' means 'I am going into the school.' It can also be used to express time, such as 'Ich fahre in zwei Stunden' meaning 'I am driving in two hours.'
I live in Berlin.
This sentence communicates that the speaker currently resides in the city of Berlin, Germany. The word 'in' is used in the sense of expressing location or position within a certain area.
My books are in my bag.
The speaker of this phrase is stating that their books are located inside their bag. The word 'in' is used here to indicate inclusion or containment within something else.
I am going to the cinema.
This sentence expresses that the speaker is going to or heading towards a particular destination; in this case, the cinema. The term 'in' is used to demonstrate movement into a place or location.