为什么 favorite exercise中exercise不用加s

exercis very favorite favorite favorite Favorite favorite swimming is my favorite.为什么不是swim 是 my most favorite car 还是,my mostly favorite car 还是,my favorite car mostly 呢 为什么? My favorite food is noodles.My favorite food are noodles.哪句对?为什么? My favorite sports is swimming.还是My favorite sport is swimming.哪句正确,为什么? Rush Hour is she favorite movie和Rush Hour is her favorite movie哪个对 为什么 running is her favorite sport 为什么用running,skating is her favorite sport 为什么his favorite .is...的 favorite 不变成动词第三人称形式? My favorite food ( ) potatoes.是用is还是are 为什么? My favorite sport is skating.skate为什么要加ing? my favorite food is hamburgers为什么be动词用is? My favorite food is fish为什么用My 不用I my favorite writer is Bob.变一般疑问句为什么