关于英语的：my favourite sport are swimming and running.为什么用ing形式?

my favourite sport is running.(用swimming改为选择疑问句 My favourite sport is swimming.为什么要用swimming 为什么favourite后加动词ing.如：My favourite sport is swimming.不是只有I l My favoutite sport ( ) swimming and running Swimming is my favourite sport 为什么要用Swimming,而不用Swim running and swimming are my favorites.这样的英语句子可以吗? 请问my favorite sport is swimming .这里的运动名称是要加ing的形式吗 running is my favourite sport 同义句 ----my favourite sport --- My parents's favourite sport is running.的问句是什么? My friend likes running and swimming.为什么用 running and swimmi which do you prefer,running or swimming?为什么动词用ing形式 英语my favourite sport