(Ecclesiastical Latin of contemporary Roman usage.)
a father (pater)
e met (ecclesiam)
i police (fili)
o or (omnipotens)
u mood (unum)
y baby (lacrymosa)
ae get (bonae, coeli)
oe get (bonae, coeli)
c (before e, ae, oe, I, y) church (coeli)
c (before a, o, u) cat (confiteor)
cc (before e, ae, oe, I, y) catch (ecce), (before other letters) bookkeeper (occasum)
ch character (Christe)
g (before e, ae, oe, I, y) generous (virgine); ( before a, o, u) gone (ergo)
gn canyon (dignati)
h not pronounced, except: (mihi miki and nihil nikil)
j yes (Jesu)
qu quiet (qui)
r trilled
s sea (sanctus)
s (between two vowels) zest (miserere)
sc (before e, ae, oe, I, y) show (ascendit)
sc (before a, o, u) scat (scutum)
ti (preceded by s, t, x or followed by a consonant) patio (hostias)
ti (unaccented, followed by vowel and preceded by any letter other than s, t, or x) Betsy (gratias)
th Thomas (theatrum)
v victor (vivo)
x extra (rex)
x ( in words beginning with ex and followed by a vowel: eggs (exaudi)
sc before e, ae, oe, I, y) bookshelf (excelsis); also eggshell
xc (before a, o, u) excuse (excussorum)
z lads (zizania)
Diphthongs
In au, eu, and ay, the two vowels form one syllable, but both vowels are pronounced, with emphasis on the first:
au (ah oo): lauda
eu (eh oo): euge
ay (ah ee): Raymundus (Ray-mun-dus)
In ei, ii, eo, ou, ai, and in certain cases, ae and oe, each vowel keeps its own sound and is a separate syllable:
ei (eh ee): diei
ii (ee-ee): filii (fi-li-i)
eo (eh o as in or): Deo (De-o)
ou (o as in or-oo): prout (pro-ut)
ai (ah ee): ait (a-it)
ae (ah-eh): Michael (Mi-cha-el)
oe (o-eh): poema (po-em-a)
Double Consonant
When pronouncing the same consonant doubled, it must be doubled in intensity: e.g., illa (eel-lah)
From The
Choral Singers Handbook, by Roy C. Bennett