TASK DEFINITION: In this task you are given a sentence. You must judge whether subject of the main clause is singular or plural. Label the instances as "Singular" or "Plural" based on your judgment.
PROBLEM: The hunger inside me swallowed him in.

SOLUTION: Singular

PROBLEM: Tap, tap, tap and the red slash once again consumed the screen.

SOLUTION: Singular

PROBLEM: Great cliffs and undulating hills rose on either side of the river, so thickly forested that the underlying stone was nearly invisible.

SOLUTION:
Plural