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What is the difference between were and have been, and are these sentences gramatically correct? 因为if从句表示不可实现的条件或根本不可能存在的条件,也就是一种虚拟的条件或假设,所以从句多用 一般过去时 或过去完成时。 … 1) some of the best … · from others conversation,i found out they mentioned i was and sometimes they also mentioned i were.