on hearing this jane looked up,on hearing this 在句中做什么成分,hearing是不是现在分词作主语

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on hearing this jane looked up,
on hearing this 在句中做什么成分,hearing是不是现在分词作主语

On hearing this,是介词短语在句子中作时间状语,在意思上与As soon as she heard this 同义,又如:
On seeing her mother,Jane ran to her.=As soon as she saw her mother,Jane ran to her.
欢迎提问,

作状语,可看做修饰后句:一听到这,简抬起头来。hearing是动名词,因为用在介词on后面,不是主语。这句可改为;When Jane heard this, she looked up.