each 是形容词也是代词和副词，当形容时后接单数名词。做代词时可直接做主语，谓语用单数。做副词时不影响谓语形式。如each student has a book.=the students have a book each.
each of + 复数名词或代词这时each是代词，这个短语表示多数中的每一个，做主语时谓语用单数。each of the students has a book.=each student has a book.
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