关于is还是are的主谓一致小问题.我对于is还是are的何时使用还不是很清楚.例如这两句话哪个对：Amotherisafriendandateacher.Amotherareafriendandateacher.写is还是are是取决与前面的主语还是后面

Question

关于is还是are的主谓一致小问题.
我对于is还是are的何时使用还不是很清楚.
例如这两句话哪个对：
A mother is a friend and a teacher.
A mother are a friend and a teacher.
写is还是are是取决与前面的主语还是后面跟的宾语?
那这句话对么？A teacher’s role is learning about students and their interests,abilities and learning styles and meeting their demand.

Answer 1

A mother is a friend and teacher.母亲应该亦师亦友.
teacher前面不要a和and连接在一起有“兼而有之”之意.
这句话不对,建议改为：
A teacher's role is to learn about students and their interests,abilities and learning styles and to meet their demand.
建议改成不定式,毕竟这是一个老师应该做而且将要做的角色.