Why is english such a difficult subject?

This, on the other hand, is a big, interesting book. Native English-speakers intuitively know what order to put words in, but this is hard to teach to those learning the language. The difference between the right and wrong order is so subtle that it's hard to explain beyond simply saying that it “just sounds right” I find it simple but we all have our own opinions..

Depends on the person, to be honest. I happen to love English, most of the time, but I absolutely hate math. Some people love math. It really just depends on who you are, and what you love. :)
~Mistermistyeyed.