We didn't know his telephone number,otherwise we would have
We didn't know his telephone number,otherwise we would have telephoned him 这句话语法是不是有问题,虚拟语气例句,we didn't know 不是应该改成 we hadn't know we hadn't know 应为we hadn't known
We didn't know 在这里是真实情况,是指(过去)真的不知道,而不是假设,所以不能用had done;we would have telephoned him 才是假设,是虚拟语气。可以改为:If we had known his telephone number,we would have telephoned him.