The Diffrence Between 'A' And 'An'

Today we were learning when to use 'A' and when to use 'An' before a word. If a word begins with a vowel which is A-E-I-O-U or silent 'H' (Eg; Hour or Honor), we use 'an'. We use  the letter 'A' for all other words except for the letters in the vowels. The photo shows the sentences we wrote to practice using the letter 'A' and the word 'An'.