What are the keywords in the following sentence? high definition time lapse of a beautiful sky with big dark clouds over the mountains shot in the evening
cloud, evening, lapse, sky

What are the keywords in the following sentence? a city seen through a window over roofs
city, roof, window

What are the keywords in the following sentence? romanesque revival structure located in construction began was completed .
begin, complete, construction

What are the keywords in the following sentence? a bald eagle perched on a dead tree extended above glacial lake .
extend, lake, tree