I see only a couple of problems, and both of them, perhaps coincidentally, have to do with the word understand.
- I read books too but I don't understand.
- I read books too, but I don't understand them.
- Although I can understand, I can neither speak nor write well.
- Although I can understand English, I can neither speak it nor write it well.
There can be. It depends. If I live in Saint Louis and say I am from Saint Louis then they mean the same thing. But if I am living in Hamilton, Canada and I say I am from Saint Louis then they clearly mean two different things. In the second case, I might say something like, "I am living in Hamilton, Ontario, but I am originally from St. Louis."Question: Any difference between "I live in Hamilton, Canada" and "I am from Hamilton, Canada?"