2.I can't understand your (laughing)at that poor child .(laugh)为什么填laughing

I can't understand your (laughing)at that poor child .

这是动名词的复合结构

因为前面的词是your所以后面要用动名词

一起构成动名词的复合结构

She didn't mind (working) overtime .(work)

mind doing sth介意做...

yong那个名词

是因为有mind的关系

有不会的可以再问我