Four children on a trampoline , in a snow covered area .
Some children are all jumping in the air at the same time .
Four children on a trampoline, in a snow covered area.
Some children are all jumping in the air at the same time.
Not all of the children are jumping in the air at the same time, there is at least one child sitting on the trampoline.
Not all of the children are jumping in the air at the same time , there is at least one child sitting on the trampoline .