While walking the dog,you were careless and it got loose and was hit by a car.

题目

While walking the dog,you were careless and it got loose and was hit by a car.
While/When+V-ing 意为“当做……时”,在句中用作——-状语.While和 walking之间省略了———.状语从句的省略必须具备两个条件①————：②——————,这时可省略从句中的——————

答案

像英语周报的题目哦!
时间
主语（和谓语动词的助动词）
主从句的主语一致
进行时
主语和助动词
这是个人看法