Usages of welche
In einer gerechten Gesellschaft spielt es keine Rolle, wen man liebt oder welche Herkunft man hat.
In a just society it does not matter whom you love or what origin you have.
Ich frage meine Freundin, welche Serie heute läuft.
I ask my friend which series is on today.
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We have an entire course teaching German grammar and vocabulary.