learn English by listening to the radio.by后面的listen to 为什么用动词ing形式?

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learn English by listening to the radio.by后面的listen to 为什么用动词ing形式?
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learn English by listening to the radio.by后面的listen to 为什么用动词ing形式?
learn English by listening to the radio.
by后面的listen to 为什么用动词ing形式?

learn English by listening to the radio.by后面的listen to 为什么用动词ing形式?
by 是介词,表示方式,所以加动词ing

by在这里是介词,介词后面用动词ing