以Ing分词为主语不仅有主动形式，还有被动形式，你掌握了吗？
活动格式Swimming is a good sport in summer。
被动形式being educated in a famous university is what most students wish for。
类似的动名词作主语：reading that book was a waster of time。
转换成形式主语，而不是真正的主语(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 worth while quarrelling with her。
非谓词ing分词使用经典例子分析解题思路
名词用法摘要ing分词用法详细说明
