2, 7-liter empty, 11 liters in the 4-liter poured 7-liter bucket

3, 11-liter bucket full, the 7-liter bucket with 4 liters of water, 11-liter bucket left 8 liters of water

4, and then poured the 7-liter bucket full, then the 11-liter bucket left 1 liters of water

5, 1-liter of water poured in a 7-liter bucket, then 11-liter bucket full, then 11-liter bucket full of water. liter bucket, and then use the water in the 11-liter bucket to fill the 7-liter bucket, then the 11-liter bucket rises 5 liters of water

6, 5 liters of water in a 7-liter bucket, and then use the 11-liter bucket full of water to fill the 11-liter bucket, then the 11-liter bucket is left with 9 liters of water

7, and then pour the empty 7-liter bucket full, then the 11-liter bucket is left with 2 liters of water.