swim是动词，然后like也是动词，动词后面是不可以跟动词的，所以说前面那个like后面要加一个to。然后后面i like swimming就是把苏喂沐动词变成了动名词swimming。这样所谓么就变成了一个名词swimming。
l like to swim 指某一次喜欢 l like swiming指向来喜欢
