1 SUFFIX (加在动词后构成现在分词;现在分词可与助动词一起构成进行时态或像形容词一样使用) -ing is added to verbs to form present participles. Present participles are used with auxiliary verbs to make continuous tenses. They are also used like adjectives, describing a person or thing as doing something. (加在动词后构成现在分词;现在分词可与助动词一起构成进行时态或像形容词一样使用)
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He was walking along the street.
他沿街走着。
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Children sit round small tables, talking to each other.
孩子们围坐在小桌子旁,相互说着话。
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It was worth it to see all those smiling faces.
看到所有那些微笑的面庞，这么做是值得的。
2 SUFFIX (用于动词后构成表示活动的不可数名词) -ing is added to verbs to form uncount nouns referring to activities. (用于动词后构成表示活动的不可数名词)