Verbs of speaking are most often followed by direct speech. The complement can only be introduced by a zero complementizer in a direct quote. In an indirect quote there will always be a morphological complementizer.
Often the complement gets a special form of the verb used in subordinate clauses. These verbs start with a prefix that can be called a complementizer, usually ee- (with variants).
Frequently a quotative is used, itweew, meaning 'he/she says' with direct speech.
Source: Fleury 2007
Source: Fleury 2007
Source: Laverdure and Allard 1983: 17