> Can someone tell me the rule in what cases one uses "a" and in what
> cases "an"? E.g., one has "an" if (and only if?) the next word starts
> with a,e,i.
>

The choice between a and an isn't so simple because it depends on the
initial sound of the word rather than the initial letter. A quick
search came up with http://www.wordinfo.info/words/index/info/view_unit/3431
which seems accurate enough. In a nutshell, 'an' is used if the word
starts with a vowel sound. As a first approximation, it includes
a,e,i,o,u but also words with an unstressed h.

I hope that helps,
Adam
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