were eating, when knocked.
met when was walking.
caught, while.
was taking, when rang.
started, when was walking
when arrived, were waiting
when while主要区别就是while可以表示一段时间,when表示时间点
were eating, when knocked.
met when was walking.
caught, while.
was taking, when rang.
started, when was walking
when arrived, were waiting
when while主要区别就是while可以表示一段时间,when表示时间点