Grammar Post 2

A or AN

I struggle with this concept because the two are so similar to eachother it is hard to know what needs to be used but there are some trickly little rules like when you use an before unsounded h these little things helped alot.

The Rules

"A" goes before all words that begin with consonants.
a cat
a dog
a purple onion
a buffalo
a big apple
with one exception: Use an before unsounded h.
an honorable peace
an honest error
"An" goes before all words that begin with vowels:
an apricot
an egg
an Indian
an orbit
an uprising
with two exceptions: When u makes the same sound as the y in you, or o makes the same sound as w in won, then a is used.
a union
a united front
a unicorn
a used napkin
a U.S. ship
a one-legged man

http://owl.english.purdue.edu/handouts/esl/esliart.html