My favourate sport is to play sport为什么加to

My favourate sport is to play sport为什么加to My favorite sport is playing basketball 中的play后面为什么要加ing形式 My favorite sport is playing……中的play后面为什么要加ing形式 I very like to sport 为什么要加to MY favourite sport is basketball 同学问我sport 为什么不加s. 单词plays sport play为什么加s My favorite sport is skating.skate为什么要加ing? My favorite sport is playing basketball.为什么加ing? swimming is a good sport为什么要改成to swim is a good sport My favorite sport is playing ………………为什么要在play后面加ing? 1.my parents play sports every day为什么sport加s 2.lily often wa my favourite sport is play basketball对嘛要不然是playing?为什么呢