Among the decisions that people make,purchasing a house is the biggest one.为什么purchasing 加in

Among the decisions that people make,purchasing a house is the biggest one.为什么purchasing 加in
Among the decisions that people make,purchasing a house is the biggest one.为什么purchasing 加in

Among the decisions that people make,purchasing a house is the biggest one.为什么purchasing 加in
为您提供精确解答
purchasing a house 是个动名词短语作主语.单独的谓语动词是不能作主语的.
所以加上ing,让它变为动名词.
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purchasing a house买房。现在分词词组做分句的主语，故加ing。如不加的话就语法错误，purchas和is冲突。没记错的话这是状语从句吧？英语抛开好久了，有点忘了…

purchasing a house 是个动名词短语作主语，purchase是动词，作主语必须加ing，因为is也是动词，不然语法不对。