How do you know if there is any activity in the yeast in the refrigerator? Every time you make bread, the buns are like stones.
Prepare half a cup of warm water
Add sugar to warm water to melt
Add yeast and let stand for 5 minutes
This is a 5 minute reaction with bubbles
After 10 minutes, the bubble is more, and it has risen.
More bubbles in half an hour later. Prove that yeast is good and still alive