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it was the oldest car taking part

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it was the oldest car taking part
take 为什么要加ing?
it was the oldest car taking part
taking part 是分词短语作后置定语的.这时它的逻辑主语就是它所修饰的 the oldest car
而 the oldest car 和 take part 是主动关系,所以用现在分词,表主动,进行.
它等于 that was taking part.(定语从句)
再问: it sped downhill at the end of the race and its driver had a lot of trouble trying to stop it. try为啥要加ing?
再答: 这是个固定句型 have trouble in doing sth 干什么事有困难 in可以省