~かどうか (whether or not)
grammar42 sentences
The pattern ~かどうか for embedded yes-no questions: 'whether (or not) X.' Built from the question particle か + どうか ('how'). Plugs into any verb taking an embedded clause: 知っているかどうか聞く ('ask whether [someone] knows'), 来るかどうか分からない ('don't know whether [they]'ll come').