1.表示过去正在进行中.比如谈到原来正在修一桥梁
2.表示过去的动作,对现在没影响.比如他原来住在北京,现在不在北京(其他地方).
3.表示过去一直做到现在.比如他从早一直玩电脑到晚上.有可能还有通宵的意思.
明白了吗?还不清楚的话再给你几个英文例句就知道了吧?
对啊,此题只强调了过去的troubled,而没有强调过去正在被!正在被!好好体会一下.
独立主格结构里being done,done,having been done的区别?
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