A lot of people learned the rule that you put “a” before wor...
A lot of people learned the rule that you put “a” before words that start with consonants and “an” before words that start with vowels, but it's actually a bit more complicated than that. Observe the following sentences.
I. A university.
II. Half an hour.
III. An one-parent family.
IV. An historical novel.
Considering grammar, we can say that: