The teacher had made flashcards to test the children on vowel sounds.

The form an is used "in the environment" before a word beginning with a vowel sound.

Moreover, the long vowel sound in a word should not be omitted.

Thus, it is most often observed in the production of vowel sounds.

That is similar to using two vowels for longer vowel sounds.

Just like the letter W, it is also very close to a vowel sound.

She made a sort of click before the vowel sound.

Yeah, it's got a little mark above the, above the vowel sound.

Many also often change form when the word that follows them begins with a vowel sound.

It is usually used to make a vowel sound longer.