hi student, here are the using of these articales: "a" is calling indifinint articale and use with only nouns or adjectives which already begin with non vowel letter, example; a book, a nice rose, book is noun and began with b, nice is adjective and began with n, and so on. "an" is also deal with it as articale a but we can use it with nouns or adjectives which begins with vowel letter such as "a,u,i,o,e,and some time h when we pronounse like: honest so we can say an honest boy! to be more easy for you try to use "a" letter with apple, you will note that is not suitable to say it, become more diffecult than say an apple isn't it ali?
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