whether, if
indirekte Ja/Nein-Frage
☞ English "if" in questions ("I don't know if he's coming") translates to "ob", not "wenn". "Wenn" is reserved for conditional "if".
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Ich weiß nicht, ob er kommt.— I don't know whether he's coming.
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Frag sie, ob sie Zeit hat.— Ask her whether she has time.