My father helps me with swimming.为什么这时候swim要变成swimming?

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Myfatherhelpsmewithswimming.为什么这时候swim要变成swimming?Myfatherhelpsmewithswimming.为什么这时候swim要变成swimming?

My father helps me with swimming.为什么这时候swim要变成swimming?
My father helps me with swimming.为什么这时候swim要变成swimming?

My father helps me with swimming.为什么这时候swim要变成swimming?
因为前面有with这个介词,后面要加动名词形式(就是ing形式)