问答题 Tell the sense relation between a and b in each pair:
1)a. He no longer likes coffee, b. He liked coffee.
2)a. Mary is working in China. b. Mary is working in Beijing.

【正确答案】1)Presupposition: sentence a presupposes b. 2) Entailment: sentence b entails a.

【答案解析】[解析] 本题考查的是Grice的Cooperative Principle和其四个原则(数证、质量、关联、方式)以及对合作原则违背所可能产生的会话含义。