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paper [误] Please give me two letter papers. [正] Please give me two sheets of letter paper. [析] paper作为纸讲为不可数名词。 [误] Each student must write paper on what he learned. [正] Each student must write a paper on what he learned. [析] 这里的paper作为论文讲，是可数名词。paper的这种用法还可以用于证件、报纸、考卷等。 parent [误] My parents and I are both interested in football. [正] My parents and I are all interested in football. [析] parents即为父母、双亲，指两个人，加上自己为三个人，所以只能用all而不能用both. pass [误] The ship pasted the channel. [正] The ship passed the channel. [析] pass为动词，而past则为副词，不要混淆，如： My father has been ill for the past two weeks. All the students passed the exam. pay [误] Please help me do this job, and I will pay for you later. [正] Please help me do this job and I will pay you later. [析] 为某工作付给工人工资应为pay somebody, 而pay for something是为某物付款，如： You can buy all the things you want. Ill pay for those. | 
