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Abstract
This thesis investigates the features held in the head of the Complementizer Phrase as a position in X-bar grammar: features shown to determine force as a major system of sentence types. It shows selection and movement as the major processes of grammar by which those features influence the distinct characteristics of different forces across languages, as they are defined as representing major functions of communication. Therefore different chapters investigate each major type of force: declarative, interrogative, and imperative. Unique types of selection and movement are described for each type of force. The investigation includes different types of languages and how they distinguish among the types of force. Sources include discussions of individual forces and of force in general. The investigation also includes sources providing a basis for understanding X-bar grammar. The findings from these sources are used for three major parts of the basis of the argument: the position of the head of the Complementizer Phrase in relation to the rest of the sentence; the structures in which selection occurs; the nature of movement within the structure. There are also sources used to describe parts of the sentence influenced by such selection and movement. In short, the investigation includes specific discussion of force among some sources, and other parts of X-bar structure in other sources. This structure is discussed in terms both of what it is and of its implementation of force. For the chapters discussing each force individually, the investigation is about their use in the context of the main clause. However, the last chapter includes a discussion of each in embedded clauses. It also includes a discussion of combining forces through conjunctions. The sources used for describing these last two points make another important point about force: while a sentence often has only one force, there are also structures allowing two forces in one sentence. Movement and selection are important in such a context as well.