What are the keywords in the following sentence? dried trees under blue sky at the forest in winter
forest, sky, winter

What are the keywords in the following sentence? A man carrying a blue jacket is unloading a chair out of a moving van.
carry, chair, jacket, move, unload

What are the keywords in the following sentence? heading its train the famous steam locomotive is making good time
head, locomotive, train

What are the keywords in the following sentence? boat moored by building function
boat, build, function