Absolutely! My mother is an English as a Second Language teacher, and she encourages her students (adults) to read English books as much as possible (novels, like children's books or whatever your level is). She says it's the only way you can get a good feel for how the language flows, even if you don't understand every single word. She also discourages looking every word up in the dictionary that you don't know, and instead trying to understand what the word probably means from context clues. She has her students write sentences and paragraphs that she will edit for grammar. Like anything, practice will only make you better.