it was the oldest car taking part 这里taking是现在分词吗?it was the oldest car taking part 为什么这里的tak要加ing形式呢 如果是现在分词的形式 那前面不是应该加BE动词吗?还有一句 a search party went into the cave hoping to find buried treasure.这里的hoping前面也没BE动词 为什么呢

it was the oldest car taking part 是 the oldest car 的定语从句 that was taking part in... 省略
a search party went into the cave hoping to find buried treasure 中的 hoping 是 a search party 发出的，是现在分词（或-ing动词）短语做与主句平行的句子结构。此句可改写成 a search party went into the cave and hoped to find buried treasure 而不影响原句的意思。

那些都是状语从句，省略了BE的型式，后面整个句子作为前面那个名词的修饰语。多看一下英语句子我构成，自然就能理解

it was the oldest car taking part 为什么这里的tak要加ing形式呢 如果是现在分词的形式 那前面不是应该加BE动词吗? 还有一句 a search party went into the cave hoping to find buried treasure. 这里的hoping前...