在fly后面加ing即可：flying
例句：
She's flying back to China tomorrow. （她明天会飞回中国）
Her long hair was flying in the wind. （她的长发在风中摇曳）
Papers were flying around in the wind. （纸张在空中飘荡）
Some kids were flying kites in the park. （几个孩子在公园放风筝）
flyIng可当名词用：搭飞机
例句：
My mother never liked flying. （我妈不喜欢搭飞机）
She's afraid of flying. （她怕搭飞机）
flying也可作为形容词：会飞的
a flying insect (会飞的昆虫)
a flying visit (短暂的停留)
例句：I'm afraid this is only a flying visit - we have to get to the station by three.
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