通俗地说 如果定语从句有主语 引导词就做宾语 如果定语从句无主语 引导词就做主语 例如 (1) A prosperity which / that had never been seen before appears in the countryside.农村出现了前所未有的繁荣.（which / that在从句中作主语） (2) The package (which / that) you are carrying is about to come unwrapped.你拿那个包裹快要散开了.(which / that在从句中作宾语）
