Usages of in
In der Elternzeit möchte meine Frau nicht nur das Baby betreuen, sondern auch an ihrer Karriere arbeiten.
During parental leave my wife not only wants to look after the baby, but also work on her career.
Ich bleibe heute in der Bibliothek.
I am staying in the library today.
In den Ferien besucht meine Nichte ihre Großeltern.
During the holidays, my niece visits her grandparents.
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We have an entire course teaching German grammar and vocabulary.