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.

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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.
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.

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.
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 him
R :Oh,if he knew how we miss him
但愿他知道我们都想念他
在if only 或if..only (但愿,要是...就好了)引起表示遗憾的感叹句中,谓语动词须用虚拟语气形式,即过去时形式
If only I had known
要是我知道那就好了
If only It would stop raining
要是雨停下来该多好
If only mother could be here
但愿母亲在这儿
If only We hadn't made any mistakes in the calculations
要是我们在计算的过程中没犯任何错误该多好
If you could only have seen it
要是你能看到这个就好了
If you had worked with greater care
要是你更加认真的工作就好了

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。