jlptsensei.com/learn-japanese-grammar/%E3%81%8B%E3%81%A9%E3%81%86%E3%81%8B-ka-dou-ka-meaning/
Explains the JLPT N4 grammar pattern かどうか (whether or not) with meaning, usage notes, and nine annotated example sentences with hints, romaji, and English translations.
GrammarJLPT and other testsJLPT N4Example sentencesJLPTSpaced repetitionTranslation