请问keep on failing 中failing是名词还是形容词

请问keep on failing 中failing是名词还是形容词 keep failing keep+形容词还是名词? keep heathy是形容词还是名词 Failing hips can be replaced 在英语文章中hip是借代的用法吗? train of failing 请问变化是形容词还是名词? keep quiet中的keep是动词吗?这里的quiet是形容词还是名词? 1.She was fined & 20 for failing to keep her dog under _____ 请问on the phone 的phone是名词还是动词?keep in touch（with）的touch是名词还是动 one-on-the-way是形容词还是名词 on record 时record是动词还是名词、形容词?