YOU SAID:

Had I known it would be so hard, I would not have asked

INTO JAPANESE

私がそれがとても難しいと知っていたら、私は尋ねなかったでしょう

BACK INTO ENGLISH

If I knew it was very difficult, I would not have asked

INTO JAPANESE

私がそれが非常に難しいことを知っていたら、私は尋ねなかったでしょう

BACK INTO ENGLISH

If I knew it was very difficult, I would not have asked