while walking walking the dog ,you were careless and it got loose and was hit by a car为什么要用 while (you are )walking walking the dog 而不是you were,不要讲的太抽象.什么一般情况,特殊情况的,听不懂,

问题描述:

while walking walking the dog ,you were careless and it got loose and was hit by a car
为什么要用 while (you are )walking walking the dog 而不是you were,不要讲的太抽象.什么一般情况,特殊情况的,听不懂,