Plural Song MP3 from Grammar Songs by Kathy Troxel To form a plural when a word ends in y, you change the y to i and add es - like spy into spies and fly into flies, enemy to enemies and cry to cries To form a plural when the word ends in y, after a vowel then you add an s - like day into days and play into plays, turkey into turkeys, holiday - holidays Words used for music that end in an o - you form the plural when you add an s - soprano - sopranos and alto to altos, piano to pianos and solo