What are the keywords in the following sentence? sheep grazing the alpine pasture with colorful autumn trees behind
graze, pasture, sheep, tree

What are the keywords in the following sentence? nothing like better in fall and winter than layered tweed .
fall, layer, nothing

What are the keywords in the following sentence? The player tries to prevent his opponent from scoring.
player, prevent, scoring

What are the keywords in the following sentence? corner of a soccer field and blue sky
corner, field, sky