What are the keywords in the following sentence? sunlight breaks through the trees on a summer day .
break, sunlight, tree

What are the keywords in the following sentence? teacher and pupils working at desk together at the elementary school
desk, pupil, teacher

What are the keywords in the following sentence? A steam locomotive lets off steam as it passes under a stone bridge.
bridge, let, pass

What are the keywords in the following sentence? new growth supported by a decaying tree in a temperate rain forest
forest, support, tree