I think Tom,as the head of a big department,should either study regularly quit his job

问题描述:

I think Tom,as the head of a big department,should either study regularly quit his job
either or 连接并列主语 谓语动词就近原则 那为什么study和quit不用三单形式·· 说的不是TOM吗?·· 应该三单呀!

因为有 should 这个情态动词
情态动词后面全都是跟 动词原形 的