''''s与of有何区别

有生命名词的所有格,如果是单数名词则加's如：Mary's car.如果是以s结尾的复数名词则只在s后面加’如：teachers' offices.如果是复数名词但不是以s结尾,则只加’s,如：children's palace 组合名词的所有格是在最后一个词尾加's如：girl friend —girl friend's someone else—someone else's a week or three—a week or three's如名词后有同位语时,则应加在同位语的词尾上,如：It is my girl friend,Mary's car.要注意的是当两个名词并列时,如表示归两人共同所有,则在最后一个名词后面加's,如果表示分别所有则在两个名词后分别加's,如：This is Mary and Jone's home.即Mary与Jone是一家人.这是他们共同的家.而These are Mary's and Jone's homes.则应译为这里是Mary的家与Jone 的家.
〔误〕It is really beautiful.It is a work of nature.
〔正〕It is really beautiful.It is a Nature's work.
〔析〕无生命名词的所有格应用of结构.但是's形式的所有格可用于以下无生命的名词：表示时间的词：today's newspaper,a twenty minutes' walk,an hour's,rest 表示长度的词：three metres' distance,a boat's length,twenty miles' journey 表示重量的名词：two pounds' weight价格名词：two dollars'worth拟人化的名词：Nature's work,nature's lesson(大自然的教训)及国家、机关、团体、城市等机构性名词：the university's library
〔误〕He is an old friend of my father.
〔正〕He is an old friend of my father's.
〔析〕这是英语中的一种习惯用法而不要根据语法去推理.如：This pen is Tom's.