区别一下单词go去（现在式）；went去（
过去式）；want要，需要
I went to shopping 是不对的，因为--
不定式to--后面只能用动词原形（区别介词to，介词to+动词-ing形式），应该为---I went to shop.或I went to go shopping.(有点罗嗦，简单点就是I went shopping.)固定词组----go shopping\fishing\swimming去购物\垂钓\游泳（都不用to，后面直接用
动名词结构）你要用不定式to那后面就必须用动词原形。
所以你的I went to shopping \I went to swimming都是错误的。原因就是上面的解释。要么省略to,要么...to go +动名词
你也可能是吧went和want相互混淆了，want需要（动词原形）和went去（过去式）就一个字母之差，如果用want，就要用want to do sth.的句型
上面几句就可以变成：I want\wanted to go shopping.后面几句也是如此改。