我係閘口面前有一間 duty free
there was a duty-free shop in front of the gate.

Cantonese Sentence Breakdown

我 ngo5
I
me
my
us
we
our
self
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
閘口 zaap6 hau2
gate
面前 min6 cin4
in front
有 jau6
also
again
一 jat1
one
single
a (article)
as soon as
entire
whole
all
throughout
"one" radical in Chinese characters (Kangxi radical 1)
also pr. [yāo] for greater clarity when spelling out numbers digit by digit
first (positional)
one part of a fraction, such as 'a' quarter, an eighth
a short duration (when used with a verb)
each
same
dedicated
from the start
間 haan4
an alternative form for 閒, idle