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

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heandhiswifeeachearn10yuan为什么是earn而不用earns而在Foreveryhourtheyskate,eachstudentraises10yuanforcharity.

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
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

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
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.