英语中的费限制性定语从句在作文中该怎么写，帮忙总结下，谢谢

非限制性定语从句：

1. 先行词具有特定性、唯一性，如：Tom's father/mother, Paris, China, President Obama 。

而 Tom's uncle/ aunt, a very beautiful city, a friend, a student等，没有特定性、唯一性，后面就不能用 非限定性定语从句。

2. 限定性定语从句缩小先行词的指代范围，非限定性定语从句只是对先行词的情况进一步补充。

3.非限定性定语从句必须用逗号和主句分开。

4. 非限定定语从句只能用 who, whom, which，whose 作关系代词，不能用that.

例如： Tom's mother is very kind, who works as a reporter. (汤姆的妈妈很善良，她是一位记者。正解。)

Tom's mother who works as a reporter is very kind. (汤姆当记者的妈妈很善良。难道汤姆还有当作家、当秘书的妈妈？！也许汤姆认为有奶便是娘，或许哪天认母猪为娘咧~)

The 29th Olympics were held in Beijing, which is the capital of China. (正解)

The 29th Olympics were held in Beijing which is the capital of China. (难道在中国首都北京之外，还有叫北京的城市？)

简单 就是(，which) 这个形式就是了