How to pronounce 發霉 in Cantonese (4 out of 5):

你確定那是黑珍珠而不是發霉 希望是吧
You're sure it's a black pearl, not a black pearl.

Cantonese Sentence Breakdown

nei5
you (informal, as opposed to courteous 您nín [您])
can be used to refer to an unspecified person
確定 kok3 ding6
confirm
那是 naa5 si6
that is
hak1
black
dark
sinister
secret
shady
illegal
to hide (sth) away
to vilify
(loanword) to hack (computing)
evil
gloomy
glum (facial expression)
unlucky
unfortunate
cursed
珍珠 zan1 zyu1
pearl
nang4
an alternative form for 能,to be able
不是 bat1 si6
is not
發霉 faat3 mei4
mildew
希望 hei1 mong6
hope
si6
is
baa6
(modal particle indicating suggestion or surmise)
...right?
...OK?
...I presume