off of the how to keep my puppy off of the sofa?keep off词组.o

off of the how to keep my puppy off of the sofa?keep off词组.of the
how to keep my puppy off of the sofa?keep off是词组.1.of the sofa 固定用法吗?2.翻译一下句子
of the sofa是词组吗？
我觉得keep off 是词组，
off the sofa？从沙发的拿开。但是为什么又要用of？