Self-introduction 自我介紹          

Colloquial 通俗語 Tung1 zuk6 jyu5

There are formal and informal Cantonese. Usually we have to use formal Cantonese in reading and writing,
we use informal Cantonese only in dialogue, e.g., the formal Cantonese for “he” is “taa1” and “keoi5” in informal.
Look at the table of pronoun below:
Formal Cantonese Informal Cantonese English
taa1
He, she , it
taa1 mun4
They
ngo5
I
ngo5 mun4
We
nei5
you
nei5 mun4
you

We can see that not all the Cantonese words have informal form (bold italics), sometimes, we use formal Cantonese in both speaking and writing.