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(1) and连接 两个单数名词（或不可数名词），表示两个概念时，谓语用复数。
Sue and I left early. 我和休早离开了。
Steam and ice are different forms of water. 蒸汽和冰是水的不同形式。
(2) 两个单数名词用and连接，（第二个名词前不加冠词）表示同一个人、物、概念时，谓语动词用单数。
The singer and dancer is to attend our evening party. 这位歌唱家兼舞蹈家将参加我们的晚会。
(3) every...and every..., each...and each..., many a...and (many a)..., no…and no…等修饰单数名词，谓语动词用单数。
Each boy and each girl has an apple. 每个男孩和女孩都有苹果。
Many a teacher and (many a) student has seen the film. 许多老师和学生都看过这部电影。
No desk and (no) chair is seen in the room. 房间里没有桌子和椅子。
(4) 单数或不可数名词被一串用and连接的形容词修饰时，可指一个概念或多个概念，需要根据意义一致的原则（指向同一事物或不同事物）决定谓语动词的单复数。
Simple and plain living is what he wants. 他想要的是简朴的生活。
English and American literature are appealing to her. 英美文学对她很有吸引力。
Ancient and modern history are the subjects we are studying. 古代史和近代史是我们正在学习的科目。
(5) and连接what主语从句时，根据意义一致原则决定谓语动词的单复数。
What he says and does do not agree. (他的言和行不一致)
What he says and does has nothing to do with me. (他的言行与我无关)
