The words ‘No, you can’t because …’ are heard way too often in life.
Boy Scout Trail Website
How pleasant it would be if the phrase were simply turned around to ‘Yes, you can when …’ ‘Yes, you can if …’ or ‘Yes, you can as soon as …’
Instead of ‘No, we can’t start the game without the umpire’, it would be ‘Yes, we can start as soon as the umpire gets here. And if he’s not here in 5 minutes Mr. Smith will stand in for him.’
Using positive words shows a positive attitude and a positive attitude makes the world a bit better.