What is the name of this: twenty. What is the girl doing: dry . In the word by, letter y has the sound of... : Long vowel i. In the word pony, letter y has the sound of..: long vowel e. In the word baby, letter y has the sound of..: long vowel e. In the word my, letter y has the sound of..: long vowel i. Mark the words where the letter y sounds like long vowel e:: lucky. Mark the words where letter y sounds like long vowel i:: why