YOU SAID:
By Thursday, I will have opened the box.
INTO JAPANESE
木曜日、私は、ボックスをオープンしているでしょう。
BACK INTO ENGLISH
On Thursday, I have opened the box.
INTO JAPANESE
木曜日に、私はボックスを開いています。
BACK INTO ENGLISH
On Thursday, I open the box.
INTO JAPANESE
木曜日に、私はボックスを開きます。
BACK INTO ENGLISH
On Thursday, I open the box.
That didn't even make that much sense in English.