What are the keywords in the following sentence? A small train sits on some tracks near an overpass.
overpass, sit, train

What are the keywords in the following sentence? some greens and meat on a white plate
green, meat, plate

What are the keywords in the following sentence? extended family watching television on the sofa at home
family, home, sofa, television, watch

What are the keywords in the following sentence? the average number of thunderstorm days per year .
day, number, year