A declarative sentence is a °sentence that can express a °statement speech act.
declarative (INF/CXN) = a speech act which simply asserts its propositional content, and the construction that expresses this speech act. Example: The English sentence Sandra picked up the children is an instance of a declarative speech act. The declarative is the most common speech act construction, and is considered the default speech act construction. (Section 12.1)