For your next question you may use "anwenden", "verwenden" or "benutzen". On the other hand you can also use Yet another sentence in German together the traces of "Um eine Sprache zu lernen muss person sie sprechen" which would seem fewer scientific. It is not particular who "Elise" was, Though https://iosund98642.wikinarration.com/6210747/the_definitive_guide_to_native