What are the keywords in the following sentence? A long train pulling cars with cars on top of them.
pull, top, train

What are the keywords in the following sentence? a cat playing on the grass at garden in autumn .
autumn, garden, grass

What are the keywords in the following sentence? small traditional boat leaving a fishing village traveling towards islands across a calm sea
boat, travel, village

What are the keywords in the following sentence? The motorcycle with the sidecar is parked near other motorcycles.
motorcycle, park, sidecar