الفهرس 
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Abstract
The present study examines the discourse of a number of American presidential debates. The selected data is analyzed using tools of functional grammar by means of corpus linguistics. Results are, then, interpreted for the purpose of deciding how presidential candidates use language to win the presidency from their opponents. Such accomplishment is conditioned by how much they succeed in persuading their audience that, as presidents, they are capable of handling the audience issues and meeting their demands. The thesis is divided into six chapters in addition to an introduction and a conclusion. The study reached a conclusion that the selection of the lexicon-grammatical tools is crucial in enabling speakers to perform a number of functions such as constructing social relations, exercising power or maintaining solidarity with the listeners. Speakers, also, have the choice to express their ideological backgrounds to others and convey their beliefs and attitudes through a number of textual tools