一、谓语动词用单数：当"名词＋and＋名词"结构表示一种事物或一种概念时，谓语动词用单数
A writer and educator has visited our school.一位作家兼教育学家参观了我们的学校。／Bread and butter is nutritious. 面包黄油很有营养。／Early to bed and early to rise makes a man healthy. 早睡早起使人健康。
二、在"名(代)词＋or(nor, not only...but also等)＋名(代)词"结构后的动词一般与or后的名(代)词呼应
Not only he but also I am surprised.／One or two days are enough to see the city. ／Either I or he is in the wrong. ／Are you or he to blame?
