be crazy about:对.着迷的
grow crazy about：变得对.着迷
前者强调结果,即一个状态
和后者强调一个过程,即变化While walking the dog,you were careless and it got loose and was hit by a car. 这里walking是现在分词做伴随状语吗？用现在分词做伴随状语需要什么条件吗？而且补全时为什么要用you are 而不是 you were您好，这句一般理解为：while 引导时间状语，而不是伴随状语，省略了you were ，因为时态一致