What are the keywords in the following sentence? legs of pedestrians walking on a crosswalk
crosswalk, pedestrian, walk

What are the keywords in the following sentence? cricket eating grass on a leaf
eat, grass, leaf

What are the keywords in the following sentence? An elderly man sits down and begins to play a tune on the trumpet.
begin, trumpet, tune

What are the keywords in the following sentence? a large jet is parked in a field
field, jet, park