What are the keywords in the following sentence? A zebra and two elephants are on a grassy field.
elephant, field, zebra

What are the keywords in the following sentence? seamless pattern with frog and toad wearing a yellow crown .
crown, frog, pattern, toad, wear

What are the keywords in the following sentence? i thought this tree with lichen and clams growing on it was really pretty .
grow, think, tree

What are the keywords in the following sentence? A skateboarder rides on the side of a large pipe.
pipe, ride, side