swim -swimming take-taking
变化规则一般有三种情况：
1.直接加ing 如：wait -waiting
2.双写末尾字母再加ing 如：swim -swimming
3.去末尾字母再加 如：take-taking
就是它的ing形式，分别是swimming和taking。
现在分词是swimming,taking，过去分词是swum taken
swim swam swum
take took taken
swimming,taking
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