What are the keywords in the following sentence? One man shows another how to golf and explains technique to him.
explain, golf, technique

What are the keywords in the following sentence? vehicular and railroad bridge leading through the calm lake .
bridge, lake, lead

What are the keywords in the following sentence? ruins of colonial buildings in the town
building, ruin, town

What are the keywords in the following sentence? portrait of a crying female child while studying with her parents quarreling at home
cry, parent, quarrel