does这里是“助动词”，所谓“助动词”是帮助主要动词（这时的主要动词是行为动词，不包括be动词）构成：否定、疑问和时态等。最常用的助动词是do和其各种变化形式如does,did；还有will,have/has等。Helikesmusic.Hedoesn'tlikemusic.否定Doeshelikemusic?疑问Whatmusicdoeshelike?疑问Didhegototheparkyesterday?疑问，过去式Hewillgotothepark.(will是助动词）但是Heistall.Heisn'ttall.Ishetall?
