What are the keywords in the following sentence? a statue in a garden next to a church
church, garden, statue

What are the keywords in the following sentence? a trainer trains an elephant .
elephant, train, trainer

What are the keywords in the following sentence? A train carries it's cars across a bridge.
car, carry, train

What are the keywords in the following sentence? military deployed planes and ships in a search for a foreign vessel in the waters
search, vessel, water