Explanation
Used to express 'whether' or 'if' in indirect questions or statements.
Formation
Verb-casual + かどうか, い-Adjective + かどうか, な-Adjective + (だ)かどうか, Noun + (だ)かどうか
Detailed explanation
The ～かどうか grammar point is used to express 'whether' or 'if' in indirect questions or statements. It is often used to express uncertainty or to inquire about information in a more polite form. ～かどうか can be used with verbs, い-adjectives, な-adjectives, and nouns.
Examples
Kare ga kuru ka dou ka shirimasen.
I don't know if he will come or not.
Kono hon ga omoshiroi ka dou ka oshiete kudasai.
Please tell me if this book is interesting or not.
Kanojo ga kirei da ka dou ka wa wakarimasen.
I don't know whether she is beautiful or not.
Kare ga sensei da ka dou ka oboete imasen.
I don't remember if he is a teacher or not.
Practice
Grammar content sourced from hanabira.org.