Work on it had begun before my sister left.work on it 是什么结构

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Work on it had begun before my sister left.work on it 是什么结构
We are now living in a beautiful new house in the country.Work on it had begun before my sister left.
我们现在住在乡间的一栋漂亮的新住宅里.这栋房子在我姐姐离开之前就已动工了.后一句可否改为
The new house had begun before my sister left.work on it 是什么结构,

The new house had begun before my sister left你要这样写那意思翻译不通啊,看上去让人不明白是什么意思.你可以改成这样:The work on the new house had begun before my sister left.
Work on it是名字加定语的结构吧.

Work on it had begun before my sister left.work on it 是什么结构 Work on it had begun before my sister left. work on it had begun before my sister left... 请问work on it had begun before my sister left 是什么句型 work on it had begun before my sister left(这是什么句型? Work on it had begun before my sister left.Work前为什么不加the work on it had begun befor my sister left. Work on it had begun before my sister left.分析句型 Work on it had begun before my sister left.是时间状语从句吗? work on it had begun before my sister *left*(离开)和I am one of Work on it had begun before my sister left.这句语法讲解下,有点迷糊. Work on it had begun before my sister left中的WORK 不是动名词作主语要加