描述性定语从句一般用which

　　Beijing, which was Chinas capital foe more than 800 years, is rich in cultural and historic relics.

　　as, than, but也可以用作关系代词。如：

　　 The project was completed on time, as was expected before.

　　 They have never met such things as he met.

　　 Tourism, holidaymaking and travel are these days more significant social phenomena than most commentators have considered.

　　 There are very few but admire his talents.

　　用作关联词的关系副词有where, when, why等，when在定语从句中用作时间状语，其先行词是表时间的名词。如：

　　 Just at the time when it became obvious that health-care resources could not possibly meet the demands being made upon them, people were demanding that their fundamental right to health-care be satisfied by the state.

　　since, before, after, as也可以用作表时间的关系副词。如：

　　 At exactly the same time as this new realization of the finite character of health-care resources was sinking in, an awareness of a contrary kind was developing in western societies.

　　 Every day since she came has been most enjoyable.

　　 On the day before the war broke out he was born.

　　 The year after she left school she spent abroad.

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