YOU SAID:
The most difficult thing I ever did was trying to understand my wife
INTO JAPANESE
私が今までにした最も難しいことは、妻を理解しようとしたことでした
BACK INTO ENGLISH
The hardest thing I've ever done was trying to understand my wife
INTO JAPANESE
私が今までしてきた最も難しいことは、妻を理解しようとしたことでした
BACK INTO ENGLISH
The hardest thing I've ever done was trying to understand my wife
You've done this before, haven't you.