What are the keywords in the following sentence? lonely boat in the pier of port
boat, pier, port

What are the keywords in the following sentence? time lapse clouds and sky over the green field before storm coming .
cloud, come, field

What are the keywords in the following sentence? members participate in a contest .
contest, member, participate

What are the keywords in the following sentence? Sleeping mother holding her child in her arms.
arm, mother, sleep