I know what an is used for, thank you very much.
'An' is instead of 'a'; you use it before words that start with a vowel.
But...
I've seen it used before abbreviations. Like, for an example;
'I got an SAT test to write on.'
or
'Have you had an MRI before?'
Those are just a few examples, though.
So, do you put 'an' in front of an abbreviation, or do you just follow the rule you follow with everything else?
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