Double negative in English has three functions: to strengthen the affirmatives, and to affirm euphemism and to strengthen the negative meaning, which are analyzed in the present paper.

• 摘要英语中的双重否定句不仅有加强肯定语气的作用，还有两个语用功能，即强调否定和委婉肯定。本文分析了双重否定句的这三种语用功能。