你到底是陳先生定陳小姐

Cantonese Sentence Breakdown

你 nei5
you (informal, as opposed to courteous 您nín [您])
can be used to refer to an unspecified person
到底 dou3 dai2
finally
是 si6
is
陳 zan6
an alternative form for 陣, battle front
先生 sin1 saang1
(used before a man's family name) Mr.
定 ding6
to set
to fix
to determine
to decide
surely
certainly
definitely
stable
calm
小姐 siu2 ze2
(noun) 1. Witness; (pronoun)
Ms; 2. Miss (before a surname)