YOU SAID:

That's excellent--much better than I could do!

INTO JAPANESE

それは素晴らしいです。私ができるよりもはるかに優れています。

BACK INTO ENGLISH

It is amazing. Much better than I could.

INTO JAPANESE

すごいですね。私ができるよりずっと上手でした。

BACK INTO ENGLISH

That's amazing. It was much better than I could have been.

INTO JAPANESE

すごいですね。それは私ができるよりもずっと良かったです。

BACK INTO ENGLISH

That's amazing. It was much better than I could have been.