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

所以佢哋亦都以最真誠嘅性行為 問候返年青人父母。
So they also ask their parents to come back with the most honest sexual behavior.

Cantonese Sentence Breakdown

所以 so2 ji5
hence
佢哋 keoi5 dei6
(pronoun) they
亦都 jik6 dou1
also
jyu5
to use
by means of
according to
in order to
because of
at (a certain date or place)
consider as
zeoi3
most
the most
-est (superlative suffix)
exceedingly
extreme
真誠 zan1 sing4
Sincere
koi3
indignant
generous
to sigh (with emotion)
性行 sing3 hang4
sexual intercourse
wai6
because of
for
on account of
on behalf of
by (in the passive voice)
問候 man6 hau6
to greet
faan1
to return (to)
to revert to
to restore
to go back
to come back
年青人 nin4 cing1 jan4
noun; young people; teenagers
父母 fu6 mou5
parents