Both the gerund and the present participle end with the "-ing" form. There is only a slight difference in some sentences between a participial phrase and a gerund phrase. The difference is emphasis. The participial construction stresses the doer or the thing/matter; the gerund construction highlights the activity. （Gerund 和 present participle 的ending都是ing。在一些句子，gerund phrase 和present participial phrase 的分別很小。兩者的不同在於強調點。Participle的結構強調「施事者或者有關的事物／事件」。Gerund的結構強調「活動」。）