Question: What language do they speak on st lucia?
Disambiguated questions and answers: question: What is the official language do they speak on st lucia?
What Antillean Creole language do they speak on st lucia?
answer: English
Patois
Saint Lucian French Creole
Patwa
Kwéyòl
Natural Questions answer: Saint Lucian Creole French
English (from the Wikipedia article "Saint Lucia")