a+ b+ c+ d+ e+ f+ g+ h+ i+ j+ k+ l+ m+ n+ s+ o+ p+ q+ r+ s+ t+ u+ v?
1、当 A and B 这样的结构作主语时,如果是指两样东西,谓语动词肯定是要用复数。如:
Copper and silver are both metals. 铜和银都是金属。
Psychology and economics are social sciences. 心理学和经济学是社会科学。
Reading and writing are different skills. 阅读和写作是不同的技能。
2、如果作主语的并列结构中的名词指同一个人、同一个事物或同一个概念,谓语动词用单数。如:
The manager and secretary was present at the meeting. 经理兼秘书出席了会议。
The manager and the secretary were present at the meeting. 经理和秘书出席了会议。
3、当and连接两个单数名词作主语,且两个名词前分别有each,every,no,many a等限定词修饰,谓语动词用单数。如:
Every boy and every girl in this class studies very hard. 这个班上的每个男生和女生学习都很用功。
4、表示加减乘除时,谓语动词用单数。如:
Two added to three equals (makes, gives, is) five. 二加三得五。
5、两个并列不定式指两个不同的动作,用复数谓语。如:
To preach and to practise are two different things. 说和做是两回事。