playing football is my favourite s------.是sports?用加s吗,为什么?

playing football is my favourite s------.是sports?用加s吗,为什么? My favourite sport is playing football.可以等于 Playing football my favourite sport is playing football my favourite sport is my favourite food is eggs .为什么egg加s了? 请问这句英语句子对吗?My favorite sports is playing football.为什么? My favourite food is noodles 这里的noodle为什么加s MY favourite sport is basketball 同学问我sport 为什么不加s. Tom likes playing football 这里play为什么要加ing 还有like为什么加S My favorite sportes is football.有语法错误吗?为什么这里要用sports复数形式? Who likes playing football on the ground.为什么like加S呢 不是很明白 three boys like playing football中的like为什么不加s Playing football not only makes me grow up…为什么make 要加s