就是动词第三人称单数的变化规则
1、直接在动词后+s
like- likes play-plays
2、以s,x,sh,ch,接尾的动词：+es
wash-washes
3、以辅音+o接尾的动词：+es
go-goes
4、以辅音+y接尾的动词：变y为i+es
fly-flies
动词短语：
+s:Plays,skips,sings,gives,starts,likes,
buys some toys,gets up comes back home
makes noodles,eats lunch drinks coffee
begins his class ,practises the piano
+es :watches TV brushes his teeth
goes to bed goes to school
does my homework does some reading
y→ i+ es:fly → flies study →studies
不规则变化：have-----has