A Little Book of French Grammar, Translated into Latin

oi, or oy, ui, au, eu, ou.

ai Faire, Aider. It is not to be pronounced Fa-i-re in three syllables, but in two, Fai-re.
ay It is the same diphthong: but it will be written thus at the end of words, Feray, Fay.
ei Peine, two syllables, such as Peindre, Ceindre, Cueillir, Orgueil, Oeil.
oi Oison, Moindre, two syllables: Fois, a single syllable, such as Mois & Moins.
oy It is the same diphthong, but it is written thus at the end of words, Foy, Loy, Moy, Enuoy. Sometimes also in the middle, such as Moyen, Enuoyer, when the following syllable begins with a vowel.
ui Destruire, of three syllables, De-strui-re: Nuire, of two syllables, Nui-re: Nuict, of one syllable, Fuite, disyllabic.
au Audience, of four syllables, Aulcun, Aultre, of two: Hault, of one syllable.
eu Seur, Meur, Peu, of one syllable. Meurement, of three syllables. Esmeu, Heureux, of two.
ou Outil, Ouvert, Ouvrir, Vouer, two syllables. Oublier, Allouer, three syllables.

There is also the syllable ie, which is like a diphthong, but for a different reason: for the sound of i and e is understood as separate, even though they constitute a single syllable, such as Miel, Ciel, Fiel, Pied. Fier, Bien, Mien, Tien, Sien, Chien, Rien, Chrestien.

OF TRIPHTHONGS.

It frequently happens that three vowels are joined together into one syllable, of the three of which is understood