like 用作介词，完全可以接动名词。最常见的词组feel like doing sth.（想要做某事），其中like 就是介词。例如：

I feel like going to Europe for a visit next summer vacation.  我好想明年暑假去一趟欧洲。

Life is just like playing dodgeball.  生活就像是玩躲避球。

Playing Chinese chess is like directing military operations.  下象棋就像指挥军队作战。

To educate the young generation in such a way is just like making the rice shoots grow by pulling them up.  用这种方法教育下一代无异于拔苗助长。

But Jennifer doesn't know anything about arts. It is just like casting pearls before swine.  但是珍妮弗根本不懂艺术，请他看画简直就是对牛弹琴。

Buying a car without trying it by yourself is just like buying a pig in a poke, isn't it?  买车时自己试都不试,这不是乱买吗?

关于主语是否用it，这个不是问题。因为it 是代词，它指代前面提到的事物或事情。所以，不必拘泥于此。