質問: 1. 僕は任務を完成**した**かどうかを確認しました。 2. 僕は任務を完成**する**かどうかを確認しました。 According to my understanding, the first is correct. But some people say that it is the second, which one is right and why?
回答: The first one means that you have confirmed that you finished something. The second one just seems weird and incorrect to me. Maybe it would make more sense if you add べき after する so then it would mean that you have confirmed that you have to finish something.