Youknowthissingular, one person
Youknowalotplural, several people
Youdon’tknowmuchsingular, one person
Youdon’tknowwhyplural, several people
Youknewhowsingular, one person
Youknewwhyplural, several people
Youdidn’tknowitsingular, one person
Youdidn’tknowwhyplural, several people
Doyouknowwhen?singular, one person
Doyouknowwhere?plural, several people
Didyouknowthis?singular, one person
Didyouknowwhere?plural, several people