he and his wife each earn 10 yuan 为什么是earn而不用earns
问题描述：
he and his wife each earn 10 yuan 为什么是earn而不用earns
而在For every hour they skate,each student raises 10 yuan for charity.里each后用的是单数啊
答
We each +复数谓语动词 主语是we each是状语
each of us+ 单数谓语动词 主语是each
each做主语肯定是用单数谓语,但第1个句子中的each并非主语.