YOU SAID:
The problem was how he could know it
INTO JAPANESE
その問題はとても難しかったので、私には解けなかった。
BACK INTO ENGLISH
The problem was so difficult that I could not solve it.
INTO JAPANESE
その問題はとても難しかったので、私には解けなかった。
BACK INTO ENGLISH
The problem was so difficult that I could not solve it.
You've done this before, haven't you.
