cause为什么要用ing形式?Around 540,000,000 people are affected by second-hand smoke,causing 100,000 deaths a year.

分类: 作业答案 • 2022-08-14 22:45:45

问题描述：

cause为什么要用ing形式?
Around 540,000,000 people are affected by second-hand smoke,causing 100,000 deaths a year.

答

原因是前面有系动词are了,一个句子里不能出现两个动词（cause也是动词）,而引起多少多少死亡前后是主动关系,因而用ing形式不用过去分词.