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being done和done用法的疑问

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being done和done用法的疑问
Being examed twice a year is a basic rule.这句用being done为什么不能用done?
being done和done用法的疑问
只有动名词才可以做句子的主语呢,被动不行
再问: __Put____ into use in April 2000, the hotline was meant for residents reporting water and heating supply breakdowns. 那为什么用put?
再答: 在这里,put到第一个逗号的这一部分是做独立主格的,而独立主格一般用被动,表状态
再问: 所谓独立主格,是指前后句主语不一样吗?
再答: “独立主格结构”是由名词或代词作为逻辑主语,加上分词、形容词、副词、动词不定式或介词短语作为逻辑谓语构成。这种结构在形式上与主句没有关系,通常称为“独立主格结构”。例如The meeting being over, all of us went home. 开完会后我们都回家了。the meeting being over相当于when the meeting was over Her work done, she sat down for a cup of tea. 她干完了活,坐下来喝茶。her work done相当于when her work was done