Articles are used to distinguish between whether or not you are talking about a specific item, or a general item (which I'm sure you know). This is actually very valuable. I've studied Latin, and sometimes you can't know which is which, because Latin doesn't distinguish. Also, I don't think 'a' and 'an' are fundamentally different. 'An' just has the extra sound to smooth speech over. It doesn't really matter if you write "a apple" or "an apple".

Also, verb conjugation in English is pretty nonexistant, compared to other languages, like Romance languages. There are usually three different verb forms: the standard (write), the past (writed) and the third person singular present (writes). I know there are some irregularities, but generally if you want to say a verb, you use the standard.