原來係咁！你真係做得好好呀！
I see! You really did a great job!

Cantonese Sentence Breakdown

原來 yun4 loi4
originally
係 hai6
(Cantonese) to be
to connect
to relate to
to tie up
to bind
to be (literary)
to involve
relation
relationship
consequence
yes
indeed
right
咁 gam3
so (Cantonese)
Mandarin equivalent: 这样zhèyàng [这样], like this
你 nei5
you (informal, as opposed to courteous 您nín [您])
can be used to refer to an unspecified person
真係 zan1 hai6
really; very
做 zou6
to do
to make
to produce
to write
to compose
to act as
to engage in
to hold (a party)
to be
to become
to function (in some capacity)
to serve as
to be used for
to form (a bond or relationship)
to pretend
to feign
to act a part
to put on appearance
to fight
to kill
to trick
to have sex
得 dak1
structural particle: used after a verb (or adjective as main verb), linking it to following phrase indicating effect, degree, possibility etc
to obtain
to acquire
to get
to gain
suit
proper
ready
finished
to be satisfied
to permit
to need to
to have gone as far as to
to have even done
can
好好 hou2 hou2
very good
呀 haa1
(particle equivalent to 啊 after a vowel, expressing surprise or doubt)