Usually after “short” vowels.

VC & CVCCCVCWith consonant digraphsPolysyllabic words
bell
bill
cull
dell
dill
doll
dull
fell
fill
gill
gull
hell
hill
hull
ill
Jill
kill
loll
lull
mill
mull
Nell
noll
null
pill
poll
roll
tell
till
toll
well
will
yell
But l as in pal
(bottom of first column)
drill
droll
dwell
frill
grill
krill
scull
skill
skull
smell
spell
spill
still
swell
swill
trill
troll
twill
chill
quill
quoll
shall
shell
shrill
thrill
allied
allot
allow
alloy
ally
Apollo
atoll
ballot
befell
bellow
belly
billet
billow
billy
brolly
bullet
bully
callow
cellar
chilly
collar
collie
dally
dollar
dollop
dolly
enroll (US)
fallow
fellow
fillet
fillip
filly
follow
folly
frilly
fuller
fully
galley
gallic
gallon
gallop
golly
gullet
gully
hello
holler
hollow
holly
mellow
silly
telly