A white duck is spreading its wings while sitting on the water.
The duck kept it's wings intact when it dived under the water to catch some fish.
The duck cannot be sitting on the water and diving under the water simultaneously.
A duck cannot be spreading it's wings while it also kept it's wings intact. It also cannot be sitting on the water when it dived under the water.
the duck can't be sitting on the water if he dove under it.