... Vinh university Foreign languages depaterment ********** An analysis of Modality in some speeches of the president Obama (Phân tích tính tình thái số phát biểu tổng thống Obama ) graduation thesis ... and discourse, text analysis and discourse analysis And then, the author mentions to the notion "modality" with the definition, types of modality, modal meanings and expressions of modality They ... means of expressing modality to persude the hearers Therefore, we decide to research on modality in some speeches of Obama to find the similarities between modality in speeches and in the other...