核心问题
Yesterday was a holiday.
yesterday 是个副词,它在句中是作时间状语,还是作主语呢?
词典解答
现代语言家们认为表示时间的副词(today, tomorrow, yesterday 等)可以用作名词,故有资格充当主语(另外的语言学家将用作主语的 today, yesterday, tomorrow 看作是名词):
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Tomorrow is Sunday. (It's Sunday tomorrow.) 明天是星期天。
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Today's my birthday! (McArthur) 今天是我的生日!
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Yesterday was a beautiful day. (Chambers) 昨天是个美丽的日子。