In lesson 15 one of the answers to the practice problems is "Li di m la verite". In what instances whould the definite article precede the noun like this?

Actually the word is laverite or verite → truth.

It is not a Haitian Creole article that precedes it in this sentence. It is a French def. article which appear in many Haitian Creole words. See this link: http://sweetcoconuts.blogspot.com/2012/03/sometimes-it-looks-like-definite.html

To add a Haitian Creole article to this word, you would say: laverite a or verite a (the truth)

Li di laverite.

Li di verite.

Li di la verite a.

Li di verite a.

all the above translates : He/she tells the truth.

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