What are the keywords in the following sentence? A train moving on the tracks in a train yard
move, track, train, yard

What are the keywords in the following sentence? the salesman discuss the deal of buying a car with woman in car dealership
buy, car, deal, salesman

What are the keywords in the following sentence? A boy on a snowboard looks down a hill.
hill, look, snowboard

What are the keywords in the following sentence? A man knelt close to the wall while he fixed a tile on it
fix, tile, wall