第2题: [简答题]Tell the sense relation between a and b in each pair: 1) a. John’s car is secondhand. b. John has a car. 2) a. Mary helped Jane. b. Jane was helped by Mary. 参考答案:1)a presupposes b.2)a and b are synonymous to each other. 答案解析:[解析] 本题主要考查的是句子之间的语义关系。句子之间的语义关系通常有四种,即同义、反义、预设和包含。判断两个句子之间的关系是否为预设关系可以采取三个步骤:一、如果句子P是真实的,则句子Q也是真实的;