The days()I spent in the village were valuable. The days()I lived in the village were valuable.

The days()I spent in the village were valuable.

The days()I lived in the village were valuable.
不理解为什么第一个用that 第二个用when

that是关系代词，when是关系副词，他们都可以引导定语从句。而选择的关键是看后面的从句的完整性。第一句和第二句的主句都是 The day were valuable. 而第一句的从句是I spent in the village.明显这是一个不完整的句子。spend花费，是及物动词，后面会跟着宾语，所以这里缺少宾语，要用关系代词that。第二句的从句 I lived in the villiage. 我住在乡村，是一个有完整意义的句子，所以用关系副词when. 这两句的意思都是相同的（那段住在乡下的日子是珍贵的。）只是表达的方法不同。根据具体情况，选择关系代词还是关系副词。
纯手打，望采纳！

是都可以的吧，不是两个都可以用的吗

你好！ 第一个days是做spend的宾语的，第二个是做整个从句的时间状语，成分不同，所以引导词不同。望采纳 记得给问豆啊！

that / which,在定语从句中做宾语I spent the days in the village when在定语从句中做时间状语I lived in the village in the days