YOU SAID:

This is the first time I have used this tool - how well does it work?

INTO JAPANESE

このツールを使用するのは初めてですが、どの程度うまく機能しますか?

BACK INTO ENGLISH

This is my first time using this tool, how well does it work?

INTO JAPANESE

このツールを使用するのは初めてですが、どの程度うまく機能しますか?

BACK INTO ENGLISH

This is my first time using this tool, how well does it work?