She had no luck finding a job.为什么用LUCK不用LUCKY
问题描述：
She had no luck finding a job.为什么用LUCK不用LUCKY
答
She had no luck finding a job.
意思是,她寻找工作并不是很幸运.
但这是为了在汉语里语句通顺才这么翻译,这里的幸运,应该是名词,所以用 luck.如果句子是
She isn't lucky with finding a job.
这里就是形容词了.