Cohesion theory was proposed by Halliday and Hasan in 1976, and then developed by them in 1985. Through the analysis of cohesive devices of the famous speech I have a Dream from the aspects of grammatical cohesion, lexical cohesion and parallelism, this paper proves that it not only functions as a device to make the text more compact, but could make the text more expressive and persuasive.
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