What are the keywords in the following sentence? blue subway train in motion at the station
motion, station, train

What are the keywords in the following sentence? portrait of a woman holding a tray
hold, portrait, tray

What are the keywords in the following sentence? the parish church built on the site
build, church, site

What are the keywords in the following sentence? flying through tropical rainforest above a fallen tree
fly, rainforest, tree