Between the discussions, the word was a/an easy task.

[jogaisenmon]

I was writing my colleague a conversion. I was confused as to which one I should write. Between the discussions, the word was an easy task. I am not confirmed yet. Please elaborate on the grammar.

 

[Skrej]

The rule is simple. When choosing between 'a' or 'an', it depends on what the first sound of the following word is. If the following word begins with a vowel sound, then choose 'an'. If it begins with a consonant sound, use 'a'.

In your case, it should be 'an easy', because the word 'easy' begins with a vowel sound.

Note that I said first sound, not first letter. The first letter may be silent or make a different sound than it normally would. For example:

An hour (because the 'h' is silent, and the first sound you actually hear is a vowel)
A university (because the first letter is pronounced more like a consonant 'y')

 

[Tarheel]

I assume you were writing either an email or a text message. In either case, you are in charge of only part of the conversation.