What are the keywords in the following sentence? old city hall of german city at the market place
city, hall, place

What are the keywords in the following sentence? burning red candle with wax dripping down the sides
burn, candle, wax

What are the keywords in the following sentence? a long red train is coming through a city
city, come, train

What are the keywords in the following sentence? people gather a city to celebrate festival
celebrate, city, festival