all kinds of sport 中为什么用sport 而不用sports?

all kinds of sport 中为什么用sport 而不用sports? 英语翻译Judy works in a sports shop.She loves all kinds of sport 为什么sports collection不用成sport collections? a great sports collection为什么不用sport He doesn't like sports.这里面为什么用sports不用sport sports star.sport为什么用复数 what sport will she play?为什么是sport不是sports [初二下单选题]:As a young man ,you should _____ all kinds of sport Swimming is my favourite sport 为什么要用Swimming,而不用Swim 为什么是sports collection,而不是sport collections. sports star为什么sport 要加S baseball is he most popular sport of all the sports（改成同义句）