"i m sure i don t know" in German I'm sure I don't know. Ich weiß es wirklich nicht. Detailed translations for "i m sure i don t know" I'm sure I don't know. I'm sure I don't know.(also: I'm blessed if I know.) Ich weiß es wirklich nicht. I'm sure I don't know. Source: opensubtitles.org Corpus by OPUS Request review Ich weiß es wirklich nicht.