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i had all the usual symptoms of someone giving up smoking 请问

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i had all the usual symptoms of someone giving up smoking 请问为什么give要加ing,请详解
i had all the usual symptoms of someone giving up smoking 请问
of someone giving up smoking ------of是介词,someone是of的介词宾语,giving up smoking 做someone的定语,自然就是ing形式了==- - -- someone who is giving up - - - -
又如:we have all heard of Shanghai being the largest city in China and it developing very fast at the moment.