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? 

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.

My classmate larry started skating when he was nine and he won the first prize in school race 啥意 初中英语作文my classmate's day ( )is Mike?He's my classmate. 改错this's my new classmate 作文 my visit to my classmate's home lingling and tom are my classmate中classmate用加s吗 求一篇题目为 “My classmate’s habits” 的作文 My classmate's name's jack.改为同句 My classmate＿jack横线上只添一个单词 JOhn is my classmate.He's seven.中文是什么JOhn is my classmate.He's seven.中文是什么 larry Larry larry 英语作文my classmate My Classmate什么意思 ( ) are my classmate What are these?These're my two ___books?A.classmate's B.classmates C.classmates' D.classmate Sandy is my classmate.对my classmate提问 a friend of my father’s,a classmate of mine么意思?双重所有格,