[Chyron8472]

From what I've been told, the best way to learn the language is to read books. Sometimes, even if you don't know the exact definition of a word, you can often discern (or recognize) what a general idea of the definition might be from the context of the word (or the sentence/paragraph around the word).

So, if you didn't know what "abhor" meant, but you saw or read about someone giving a potato to Alcoremortis, and she got angry or disgusted and said "Eww! I abhor potatoes!" You would be able to discern from the context that "abhor" indicates a negative opinion of some kind even if you're a bit fuzzy on the details.

So I would recommend reading a lot. It will help you.

[EDIT:] Oh, and when I recommended reading books, rather than just reading in general, it's because if you try to learn proper English from reading forum conversations, facebook posts or twitter feeds on the net, then you'd probably get a number of things wrong because there are a lot of people on the net who couldn't spell, punctuate or have proper grammar skills even if their lives depended on it. So long as your primary teaching tool isn't from people who are themselves ignorant, you should be okay.