2. 运用非限定性定语从句的情况：
（1）关系代词指代整个主句内容
e.g. Our new house has a lovely garden, which makes us very happy.
（2）当先行词是专有名词或物主代词和指示代词所修饰时，其后的定语从句通常是非限制性的。例如：
Charles Smith, who was my former teacher, retired last year.
（3）当出现some, many, few, a few, little, much, most, two of which, whom等结构时
e.g. You’ve made many mistakes, most of which were due to your carelessness.
3. 限制性定语从句与非限制性定语从句的区别：
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类别
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语法意义及特征
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例句
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限制性定语从句
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对先行词起修饰限制作用，如果去掉，主句意思就不完整明确，这种从句与主句的关系十分密切，写时不用逗号分开。
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The accident happened at the time when I left.
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非限制性定语从句
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对先行词作附加的说明，与主句的关系不十分密切，较松散。从句和主句之间用逗号分开，相当于一个插入语，不能用that引导，关系代词做宾语时也不能省略。
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His mother, whom he loved deeply, died ten years ago.
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