Here they are - "I" and "We."
Use "I" when there has been a blunder or blame needs to be shouldered. This shows your team that you take responsibility instead of pointing fingers when things fall short or go wrong.
Use "we" when something has been accomplished. This shows that you give the credit to the team when there is a win.
Those two little words have a huge impact on how you communicate as a leader. Use them wisely.