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.

现在分词做定语，相当于一个从句
所以giving在这里的用法相当于who gives up...

因为要做状语用，语法书上有解释，一个一个写出来太麻烦