as if 虚拟语气的问题,He talks about Rome as if he had been to there

as if 虚拟语气的问题,He talks about Rome as if he had been to there as if引导的虚拟句是否遵循时态倒退原则呢?He talks about Rome as if he had been 虚拟语气He talks as if he knew where she was .He talks as if he He talked about London as if he had been there. He appeared as if he were sick.后面虚拟语气为什么用were而不是had been 英语虚拟问题He looks as if he had been ill for long.虚拟语气定义是说动作或状态不 有关虚拟语气的问题noisy as it was,he went on reading as if nothing___ He is talking so much about America as if he(had been)there. he talks as if he ___ abroad before .A had really been B has as if虚拟语气问题 虚拟语气时态This child talks as if he were a man.这句话是对什么时态的虚拟啊?这里为 as if 的虚拟语气?