I have never been swimming.句子里swim后面要加的ing是因为be的存在?

I have never been swimming.句子里swim后面要加的ing是因为be的存在? I have never been swimming.这个句子是否正确?swim后面要加ing吗?请说一下这里包含的语法 Did you go swimming的swim要加ing吗? went swimming 为什么swim要加ing swimming lesson为什么swim要加ing I have a swimming lesson为什么swim用ing形式 1.I have ever been there 我想表示的是我曾经去过那里 been 后面要不要加to I went to swimming.swimming不是swim的ing形式吗?它在这个句子中做什么成分,为什么不用s i like swimming为什么加ing而i can swim为什么不加ing what‘s your hobby 回答要不要加ing 如：是swim 还是swimming be后面的分词要加ing吗? 什么时候be动词后面的单词要加ing