1、adj. 好的；优良的；愉快的；虔诚的n. 好处；善行；慷慨的行为adv. 好。

2、例句：

I only use that on special occasions, so its as good as new.我只在特殊场合用，所以它完好如新。

Its a good thing you arent married.幸好你没有结婚。