do you know?
自分の身長と体重って、わかる?
Do you know your height and weight?
この歌の歌詞って、わかる?
Do you know the lyrics to this song?
母語で一番長い言葉って、わかる?
Do you know what the longest word in your native language is?
ジョンって、わかる?
Do you know John?