What are the keywords in the following sentence? time lapse of clouds streaming through a valley to the sea
cloud, sea, stream

What are the keywords in the following sentence? detail of stained glass window of builder as written work
builder, window, work

What are the keywords in the following sentence? poet reads his poetry on tuesday .
poet, poetry, read

What are the keywords in the following sentence? A yellow and red train with lights on rounding a curve on the tracks.
light, round, train