What are the keywords in the following sentence? The man is clearing brush from a forest.
brush, clear, forest

What are the keywords in the following sentence? High flying jet plane as seen from ground on cloudy day.
day, fly, ground

What are the keywords in the following sentence? A train coming out of an enclosure under a snowy mountain.
come, mountain, train

What are the keywords in the following sentence? saucer flying through the clouds above earth
cloud, earth, fly