Her native language was German, but she had received her schooling in the Netherlands and she wrote her diary in Dutch.
Anne spoke fluent Dutch, very good German, fair Swiss German, a schoolgirl level of French, and a rather comical English.
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Anne spoke fluent German and Dutch, some conversational French, a childish level of English, and she could read Swiss German fairly well, though not speak it.
Anne Frank primarily spoke Dutch, as she was born and raised in the Netherlands. She was also fluent in German and had started learning English while in hiding.