"The existence of a conversational meaning must be able to be derived." [1] This is a word Grice once said. In Grice's view, conversational meaning can be perceived by intuition. But once this intuition cannot be replaced by an argument, it cannot be regarded as conversational meaning. In our life communication, there are often such phenomena: in order to express some intention, the speaker often deliberately violates a certain criterion in the principle of cooperation. If the listener wants to quickly understand the meaning of the conversation, it is necessary to combine his own understanding of the discourse to deduce. First, each word has its own meaning which does not depend on the context or other background knowledge. This kind of meaning may be a collection of multiple meanings. Secondly, if we meet the problem that the speaker is unable to confirm whether the speaker complies with the conversational principle, we should assume that the speaker should at least observe the general principle of cooperation. Then, combining the context and relevant background knowledge, the author combines the intention of the speaker to analyze the discourse, so as to understand the real meaning of the speaker. In this process, the listener always assumes that the speaker is in compliance with the general principle of cooperation. At the same time, when the speaker speaks some conversational words, it is assumed that the listener can infer the true meaning of his or her speech according to his background knowledge and analysis level. In Grice's view, it is far from enough to analyze the meaning of conversation by relying on the grasp of intuition, and it also needs to be a rigorous derivation, which should be a general model. Grice, a general derivation model of conversational meaning, is explained as follows: "the speaker speaks the discourse P, and the listener thinks that the speaker will not cooperate without any reason; unless the speaker tries to convey the meaning of Q, Otherwise, he can not abide by the principle of cooperation, which leads to the interruption of communication; the speaker has already understood the meaning of what he said as Q; the speaker does not prevent the listener from understanding Q, expecting or at least allowing the listener to understand Q; therefore, the conversational meaning of the speaker is Q. " The listener deduces the conversational meaning of discourse through the analysis of cooperative principle. In order to explain the detailed derivation process of conversational meaning, the author will give examples. Although there are some violations of certain rules in the principle of cooperation in different degrees, the listener has the right to assume that the implied things of the speaker's speech are based on the principle of cooperation. Thus, the listener can deduce the conversational meaning implied by the speaker's speech smoothly<br>
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