定语从句是英语语法中的一个重要概念，尤其在高中英语语法学习中占据着核心地位。定语从句是用来修饰名词或代词的句子，它在主句中充当定语的角色，提供关于先行词的附加信息。这个文档"2020年高中英语语法填空专题分类训练：定语从句(含详解)"显然是为了帮助学生理解和掌握定语从句的使用，通过练习和解析来提升这方面的能力。
1. 定语从句可以由关系代词（who, whom, whose, which, that）或关系副词（when, where, why）引导。例如："The Science Museum, which we visited during a recent trip to Britain, is one of London's tourist attractions." 这里的"which"引导的定语从句修饰"The Science Museum"。
2. 关系代词在从句中可以作主语、宾语或定语，例如："Felicity Killer, a 32-year-old British woman, who has a Chinese husband, still remembers the excitement…" 这里"who"作主语。
3. "whom"通常用作宾格，例如："He met my brother, from whom he got the news of my marriage." "whom"在这里作"met"的宾语。
4. "whose"表示所属关系，如："The books on the desk, whose covers are shiny, are prizes for us." "whose"修饰"books"，表示书的封面。
5. 关系副词"when"表示时间，"where"表示地点，"why"表示原因。例如："I can still recall the day when I sat on the stairs of a temple in Nepal." "when"在这里引导定语从句，修饰"day"。
6. "that"可以用作关系代词，引导限制性定语从句，且在口语和非正式写作中，"which"和"that"经常可以互换。例如："We shouldn't spend our money testing so many people, most of whom are healthy." 在这里，"whom"可以替换为"that"。
7. "as"和"which"都可以引导非限制性定语从句，但"as"通常用于比较和让步状语从句，而"which"则更通用。例如："Everything that is about a person can help us to know him, from his appearance to the kind of food he eats." "that"在这里引导限制性定语从句。
8. "the reason why…"结构中，"why"引导的定语从句解释"reason"的具体原因，如："Mencius believed that the reason why man is different from animals is that man is good."
9. 当先行词为"the same", "such", "those"等时，通常用"as"引导定语从句，如："Many young people, most of whom were well-educated, headed for remote regions to chase their dreams." 这里的"whom"可以被"as"替换。
10. "many of + which/whom"用来引导非限制性定语从句，修饰前面的名词，如："He wrote a lot of novels, many of which were published in the 1990s."
通过这些例子，我们可以看到定语从句在句子中的灵活性和多样性。了解并熟练运用定语从句，能够使我们的英语表达更加准确和丰富，这也是高中英语语法学习的重要目标之一。
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