What are the keywords in the following sentence? An old war plane sits on the tarmac.
plane, sit, tarmac

What are the keywords in the following sentence? mother and son throw to the stone on the beach near the sea
mother, sea, stone, throw

What are the keywords in the following sentence? A farmer works on their farm.
farm, farmer, work

What are the keywords in the following sentence? colorful toy train making its way through the verdant valleys
train, valley, way