一次英语考试，班里的学生们正认真答卷，突然，老师出了一道难题：“What is the opposite of 'always'?”（“always”的反义词是什么？）全班陷入沉思，只有一个机智的小男孩举手回答：“Teacher, 'never' is the opposite of 'always', and 'sometimes' is the opposite of 'never'. So, the opposite of 'always' is 'certainly'!"（老师，'always'的反义词是'never'，而'never'的反义词是'sometimes'。所以，'always'的反义词就是'certainly'！）全班都被他的回答逗乐了！