What are the keywords in the following sentence? buttons in the shape of a heart .
button, heart, shape

What are the keywords in the following sentence? Lady feeding a baby elephant in an exhibit by the water.
elephant, exhibit, water

What are the keywords in the following sentence? The workers on the roof are installing shingles where the storm ripped some off.
roof, shingle, worker

What are the keywords in the following sentence? boats in the sea on a hazy evening
boat, evening, sea