ing分词做主语不仅有主动形式也有被动形式，你是否掌握？
主动形式Swimming is a good sport in summer.
被动形式 Being educated in a famous university is what most students wish for.
类似的动名词做主语：reading that book was a waster of time.
变形为it做形式主语代替真正的主语（ing分词）
1.It was a waste of time reading that book.
2.It is dangerous standing in the middle of the street.
3.Is it worthwhile quarrelling with her.
非谓语ing分词用法经典例子分析解题思路
动名词用法汇总ing分词用法详解
