动词不定式表示【意料之外的结果】，而现在分词表示【意料之中的结果】如： His parents died , leaving him an orphan.父亲去世了，（结果）他成为孤儿。 Tom got to the station only to find the train had gone.汤姆到达车站，却发现火车已经开走了。
