my car was being repaired when it was stolen为什么有being

My car was being_______when it was stolen. It is being repaired. It was stolen twenty years ago when It was bought by my father是否可以说It was being bought by my fat 当时他正被车撞倒是不是翻译为When he was being knocked down by the car 当时他被车撞倒是不是翻译为When he was being knocked down the car It is repaired 和 It is being repaired有什么区别啊 the car which-----is my uncle's A.is repaired B.is being rep is being repaired by my friend he was believed to have stolen it 为什么有was,believed是怎么回事,是什么时 it happened many years ago.When i was in universty.Being a s she was afraid (of being seen)for being late为什么要加being?