my money （is running out） 括号里为什么不用被动呢 为什么不可以用 is being run o

un out (of sth) (of a supply of sth) 是一个固定搭配,只有主动形式（指供应品）用完,耗尽; （指人）用完,耗尽（供应品）:The petrol is running out/We are running out of petrol。汽油快用光了[我们的汽油快用光了]。* Our time is running out/We are running out of time。我们剩下的时间不多了。* Could I have a cigarette?I seem to have run out (of them)。给我一枝烟好吗?我的（烟）已经抽完啦。