She works in television as well as writes children’s books. 她在电视台工作，还写儿童读物。

②表来源时：

He felt obliged to answer his father’s letter. 他感到不得不回他父亲的信。

③当被修饰的名词后有同位语修饰时：

Mary’s husband, a policeman, has just been here. 玛丽的丈夫是个警察，刚刚来过这儿。

3. 必须用of 所有格的情形

①用于无生命的事物时：

He sat down on the edge of the bed. 他在床边上坐下。

That view of the case did not occur to me before. 对案情的这种看法过去没在我脑中出现过。

②表同位关系时：

The city of Newcastle lies at the mouth of the Newcastle River. 纽卡斯尔城位于纽卡斯尔河河口。

③当中心词是名词化的名词时：liuxuepaper.com