What are the keywords in the following sentence? The yellow fire hydrant on the sidewalk has chains on it.
chain, hydrant, sidewalk

What are the keywords in the following sentence? dollars falling to the stack of dollars
dollar, fall, stack

What are the keywords in the following sentence? Two small children are being tickled on their couch by their mom.
couch, mom, tickle

What are the keywords in the following sentence? get the recipe for ingredient and type of dish
dish, ingredient, recipe