自学英语,When did it start raining.一个句子里的start doing是怎么回事?

来源：学生作业帮编辑：搜搜做题作业网作业帮分类：综合作业时间：2024/06/13 08:26:36

自学英语,When did it start raining.一个句子里的start doing是怎么回事?
一个句子不是不能够有两个动词吗?start raining是怎么回事?raining是动名词?
无法理解...

start doing 是固定词组.raining 可以理解为动名词

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