2016职称英语卫生类语法之主谓一致：

由连接词and或both …… and连接起来的合成主语后面，要用复数形式的谓语动词。如：Lucy and Lily are twins./ She and I are classmates./ The boy and the girl were surprised when they heard the news./ Both she and he are Young Pioneers.

注意：(1)若and所连接的两个词是指同一个人或物时，它后面的谓语动词就应用单数形式。如：The writer and artist has come.(2)由and连接的并列单数主语前如果分别有no,each,every more than a (an) ,many a (an)修饰时，其谓语动词要用单数形式。如：Every student and every teacher was in the room./ No boy and no girl likes it.