主谓一致问题
二． 谓语用复数情况
1． 由and, both …and, 连接的并列主语，和both ,a few, many ,several 等修饰语后面谓语动词通常用复数形式。
Few people know he and I were classmates when we were at college.
2．集体名词police, public, militia, cattle ,class ,youth后常用复数形式的动词
The Chinese people are brave and hardworking
The cattle are grazing in the sunshine
3．当表示民族的词与冠词合用当主语，谓语动词用复数形式
The Japanese were once very aggressive
4．某些形容词前面加定冠词表示一类人，做主语时候，谓语动词用复数
The rich are not always selfish
5．不可数名词作主语，其前有表示数量的复数名词修饰时，谓语动词用复数
Three million tons of coal were exported that year