An orphan is a child who’s parents are dead. 

定语从句中表“…的”引导词只有 whose，所以把 who’s 改为 whose。 

This is the very thing which I lost yesterday. 

如果先行词为物且前有 the only, the last, the very 修饰时，定语从句的引导词只能用 that。 

This is the car for that I paid a high price. 

定语从句的先行词为物，而且引导词放在介词后时，只能用 which. 

She is one of the students who has passed the exam. 

定语从句修饰 one of 加上复数名词时，复数名词是定语从句的先行词，因此把 has 改为 have。 

This is the place where we visited last year. 

定语从句的先行词用关系代词还是关系副词要看定语从句中缺不缺主语或宾语，如缺用关系 代词，如不缺用关系副词。此句中 visit 为及物动词，后无宾语，因此把 where 改为 which 或 that。 

I, who is your friend, can understand you. 

定语从句的谓语动词应与其先行词保持一致，因此把 is 改为 am。 82. China is a developing country, that is known to all. 非限定性定语从句的引导词永远不会是 that，因此把 that 改为 which 或 as。

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