My classmate Larry started skating when he was nine and he won the first prize in the school race.中的skating为什么要用ing形式?还有这一句：my hobby is collecting old coins 中 collecting 也是为什么要用ing形式?

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My classmate Larry started skating when he was nine and he won the first prize in the school race.中的skating为什么要用ing形式?还有这一句：my hobby is collecting old coins 中 collecting 也是为什么要用ing形式?
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My classmate Larry started skating when he was nine and he won the first prize in the school race.中的skating为什么要用ing形式?还有这一句：my hobby is collecting old coins 中 collecting 也是为什么要用ing形式?
My classmate Larry started skating when he was nine and he won the first prize in the school race.中的skating为什么要用ing形式?还有这一句：my hobby is   collecting old coins 中 collecting 也是为什么要用ing形式? 

My classmate Larry started skating when he was nine and he won the first prize in the school race.中的skating为什么要用ing形式?还有这一句：my hobby is collecting old coins 中 collecting 也是为什么要用ing形式?
start doing sth.
start to do sth.两个翻译成汉语都是开始做某事,但是是有差别的,后者强调的是从现在开始做,所以他9岁开始做的事应该用start doing
doing 和 to do 通常都表示不同的意思,如forget to do sth.忘记做某事（这件事没做,忘做了）
forget doing sth.忘记做了某事（做了这件事,但是忘了自己做了）；like to do表示这会儿想要做什么,喜欢做什么,like doing 则是一直都喜欢
第二个句子collecting 是动名词,名词的形式动词的意思,不知道你要问的是不是为什么不用 to collect,这个你可以参考一下like to do 和like doing 的用法.

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