From the analysis of the authentic data of the criminal cases, this paper is to investigate the function of the presupposition in qualitative way. The paper shows that presuppositions were used in courtroom inquiry by different participants for the purpose of investigation, confirmation and trapping. The lawyer employs the strategy of presupposition is to undermine the reliance of the testimony and try to reveal the factual situation of the case. For the defendant, he/she will try to identify the presupposition traps in order to avoid answering the presupposition question.
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