What are the keywords in the following sentence? car dealer bought car at auction .
buy, car, dealer

What are the keywords in the following sentence? apples grow on a branch against the blue sky
apple, branch, sky

What are the keywords in the following sentence? few of my closest friends came to join us for brunch .
come, friend, join

What are the keywords in the following sentence? A cat perched on the ledge of a white bathtub.
cat, ledge, perch