But if only you have sent in your letter earlier.（书中句子）但我觉得应用had sent表示对过去虚拟.
问题描述：
But if only you have sent in your letter earlier.（书中句子）但我觉得应用had sent表示对过去虚拟.
答
had sent表示对过去的过去的虚拟
过去完成时 一定是建立在 过去 一个模糊时间段的 过去。
答
你的理解是正确的查阅相关资料如下If only引导的感叹句W :If only I come a few minutes earlier R :If only I came a few minutes earlier 要是我早几分钟来就好了W :Oh,if he knows how we miss himR :Oh,if he kn...