文中-ing的用法有：
I crossed the street to avoid meeting him.(avoid doing sth.)
It was no use pretending that I had not seen him.(it is no use doing sth.)
I never enjoy meeting Nigel Dykes.(enjoy doing sth.)
I had to think of a way of preventing him from following me around all morning.(介词后跟-ing）
was just wondering （过去完成时）
You're not busy doing anything,are you?'（be busy doing)
mind my coming (mind doing)