skate 是动词,英语中一个句子只有一个主语,谓语和宾语,这里主语是she,谓语是started,宾语是ice skating ,如果不用skating 而是原型skate 的话,相当于一个句子里面有两个动词,冲突,而且前面并没有to ,所以需要将skate的动词形式转化为名词形式,加ing变成动名词形式,性质上是名词.
She started ice skating when she was four.为啥要用skating?
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