How to pronounce 切勿 in Cantonese (5 out of 6):

要加上"切勿模仿"
And you add "Don't be like that".

Cantonese Sentence Breakdown

jiu3
important
vital
to want
to ask for
will
going to (as future auxiliary)
may
must
(used in a comparison) must be
probably
if
essential points
necessary
necessity
to desire
to need
should
加上 gaa1 soeng5
plus
切勿 cit3 mat6
must not
模仿 mou4 fong2
imitate