What are the keywords in the following sentence? armed force learn the proper way to search vehicles .
force, search, vehicle

What are the keywords in the following sentence? the bridegroom puts the ring on the bride .
bridegroom, put, ring

What are the keywords in the following sentence? time lapse footage with tilt up motion of the sun streaking through window of ruin
footage, motion, streak, tilt, window

What are the keywords in the following sentence? a black crow perched on a tree
crow, perch, tree