What are the keywords in the following sentence? time lapse of a highway with cars moving by
car, highway, move

What are the keywords in the following sentence? A young lady plays a piano while another plays a violin in harmony for a crowd.
crowd, lady, piano

What are the keywords in the following sentence? rain drops falling from a leaf
drop, fall, leaf, rain

What are the keywords in the following sentence? aerial shot of a man driving small fishing boat
boat, drive, shot