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all做主语的用法

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all做主语的用法
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答案和解析
all 作主语时,可指人,也可指物,
指人时:all=all the people ,故谓动用复数.如:Since all are here ,let's begin our class.
指物时:all=everything ,故谓动用单数.如:All is silent on the island now.此时岛上一片沉寂.
All I can do is to work hard .