Italian words are divided into syllables as follows:
A single consonant goes with the following vowel.
Italian
English
ca–sa
house
po–si–ti–vo
positive
Double consonants are divided.
Italian
English
bab–bo
dad
ros–so
red
bel–lo
beautiful
at–to
act
Two consonants, the first of which is l, m, n, or r, are divided.
Italian
English
al–ber–go
hotel
con–ten–to
contented
am–pio
ample
for–tu–na
fortune
Otherwise, a combination of two consonants belongs to the following syllable.
Italian
English
ba–sta
enough
fi–glio
son
pa–dre
father
ba–gno
bath
so–pra
above
sa–cro
sacred
The first of three consonants, except s, goes with the preceding syllable.
Italian
English
sem–pre
always
fel–tro
felt
mem–bro
member
men–tre
while
BUT
Italian
English
fi–ne–stra
window
pe–sche
peaches
mi–ne–stra
soup
mo–stro
monster
Diphthongs and triphthongs are never divided.
Italian
English
nuo–vo
new
mie–le
honey
per–fi–dia
spite
uo–mo
man
mai
never
lin–gua
language
suoi
his
pi–gliai
I took
Diphthongs may occur in stressed or unstressed syllables. However, when a diphthong is broken by stress (the vowel i or u directly bears the stress), then the two vowels break into separate syllables.
Italian
English
mi–o
mine
tu–o
yours
spi–a
spy
ma–ni–a
mania
rin–vi–o
postponement
te–ra–pi–a
therapy
al–le–gri–a
joy
far–ma–ci–a
pharmacy
From:https://www.dbfei.com/Article/yidaliyu/201311/6988.html