You can't imagine what difficulty we had walking home in the snowstorm.这里的walking作什么成分?修饰什么吗?

You can't imagine what difficulty we had walking home in the snowstorm.
这里的walking作什么成分?修饰什么吗?

walking 是固定搭配have difficulty (in) doing sth.中的一部分,没必要弄清它作什么成分,只是记住这个短语及意思就行了,意为:做某事有困难.
句意:你无法想象我们在暴风雪中步行回家遇到了多大的困难.

这句话首先是个宾语从句。imagine后面是个宾语从句，并且宾语从句中宾语前置，后面又用了一个定语从句，原句是应为;you cannot imagine （that )we had what diffcult （in） walking home in the snow.这是我的个人看法，仅供参考。