This is the 5415th most frequent Chinese word.
佢係
"佢係" means "He/She is" in Cantonese.
The phrase '佢係' functions to introduce a predicate about the subject '佢'.
佢係我嘅朋友。
They are my friend.
In this sentence, '佢係' is used to define the professional role of the subject '佢'.
佢係教書嘅老師。
They are a teacher who teaches.
Here, '佢係' is applied to describe the attributes of the subject '佢'.