It's no good doing sth. 这个句型其实是一个省略介词in的句型,完整形式是It's no good in doing sth. 其中,good 是形容词,和介词in 搭配,后面接动名词短语,表示在做某过程中没有益处。
请看例句:
It's no good reading in the sunshine.
在太阳底下看书毫无益处。
It's no good staying up late at night.
晚上熬夜不睡没有好处。