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

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 as if 虚拟语气的问题,He talks about Rome as if he had been to there 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 talks as if he ___ abroad before .A had really been B has 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 He appeared as if he were sick.后面虚拟语气为什么用were而不是had been 虚拟语气问题if引导的虚拟语气,从句时态倒退一步吗?主句呢?在对过去进行虚拟时,是不是 if sb had done s 虚拟语气 ifif引导的虚拟语气,从句时态倒退一步吗?主句呢?在对过去进行虚拟时,是不是 if sb had done He is talking so much about America as if he(had been)there. He talks as if he had done all the work himself.怎么翻译? He talks as if he -----everything in the world.AknowBknewcCk