When is "e" used instead of "y" for "and"?
Is it only when the word following "y" begins with an "i"?
So, NOT... Voy a trabajar con Jane y Irene.
But instead... Voy a trabajar con Jane e Irene.
Any other reasons? Any other examples?
4 Answers
This from the net 
Y becomes e when it precedes a word that begins with the i sound, while o becomes u when it precedes a word that begins with the o sound. Typically, then, the y becomes e when it precedes most words that begin with i- or hi-, and o becomes u preceding words starting with o- or ho-. Y does not change before words, such as hierba, that begin with the y sound, regardless of spelling.
To facilitate pronunciation, "E" replaces "Y" when the word preceeds a word with an "I" sound such as "indio," "hijo,"invocar," idioma," "hipódromo," etc.
¡Gracias! Yo no s?u?p?e? sabía acerca de la "o".
In principle you could use either verb, but "sabía" is more likely here. Another thing is your "yo" -you only use it if you are making a contrast, such as "He knew it, but I didn't know it" (he vs. I). If you use it like that, we'd be wondering who are the other ones you are comparing yourself against.
¡Gracias! Yo no s?u?p?e? sabía acerca de la "o".
Please correct my wording if it is incorrect.
