she always goes swimming （为什么swimming用ing形式）

she always goes swimming （为什么swimming用ing形式） swimming club 中的swim为什么要用ing形式? I have a swimming lesson为什么swim用ing形式 she likes swimming 为什么要加ing swimming pool中的swimming为什么要双写加ing Tom always goes swimming on Sunday.(改为一般疑问句） which do you prefer,running or swimming?为什么动词用ing形式 He wants to join the swimming club为什么要用ing形式? She's(goes/go)to swimming Lingling often goes swimming on weekends 为什么swim要加ing?这句话是什么 he usually goes swimming in his fer time为什么要加ing can you help me with swimming.请解释一下为什么要用ing形式,以及一些关于help,和要加