My hobby is doing sports.My hobby is doing exercise.急

My hobby is doing sports.My hobby is doing exercise.急 [初二英语] “My hobby is doing sports .” 的doing为什么不是do? It is my hobby+ to do还是doing My hobby is ( ) 是填to do还是doing? my hobby is playing basketball.为什么是be doing my hobby is 后面加的是doing还是do? my hobby is to do sth /doing sth ____ is my hobby. swimming,hobby,my,is. my hobby is music My hobby is ___basketball _______ is my hobby.