由连词and连接的并列成分指同一概念时、指不同概念时
"no/each/every/many a+单数n.+and+no/each/every/many a+单数n."作主语
集体名词family,class,team,group,public,audience,crowd,people,polic,team,group.强调整体用?,强调成员用?
表示一类人、物的the poor/rich/dead/injured/wounded等和the+姓氏复数作主语
形复意单:maths,physics,politics,news作主语
单复数同行:sheep,deer,means,works(工厂)等作主语,谓语动词的数和实际意义一致