- In a stressed syllable when letter A is by itself, in is usually vowel /æ/, as in black cat.
- In a stressed syllable when letter A is with another letter (ai, ay, or a + e at the end), it is usually vowel /eɪ/, as in gray day.
- In a unstressed syllable, such as the first syllable in words like about and across, letter A is usually vowel schwa /ə/.
See more about spelling rules for vowels here.
In other contexts, letter A can represent many other vowel sounds. Watch the video below for a class on vowel sounds vs letters in which we talk about letter A: