在英语中,ing是动词的一种后缀（即在动词后加上该后缀）,是进行时态（be+doing）的动词一种分词形式,如：He is doing his homework.（他正在写作业） 同时,某些动词之后加上该后缀可以变为其名词形式,如：swim→swim...
arrive为什么变为arriving
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