在一篇双语阅读看到···spend most of his time wrapped up in ..为什么是过去分词的

在一篇双语阅读看到···spend most of his time wrapped up in ..为什么是过去分词的 He wrapped(wrap)the fish up in a piece of newspaper 为什么这里的动词 He spends most of his time in traveling.这里的travel为什么加ing He spend all his free time in one of his four glass-houses是什 spend的过去式,过去分词, spend 的过去分词是什么 spend 的用法Most of his money _____on the rent . he spend most of his time playing outside and he _ the math 过去分词变形·求解·there were hundreds of drivers in the traffic jam. spend的过去式和过去分词 get up的过去分词 He sat rooted in his seat.请问这句中的rooted用过去分词是个什么用法?为什么选过去分词?