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 slow revealing of her expanse of skin nearly caused an explosion in his gut.

SOLUTION: Singular

PROBLEM: The back yard was essentially a long sweeping lawn with pockets of ruddy sand dunes and rocks running into the wild ocean.

SOLUTION: Singular

PROBLEM: Our experiments were... well, let's just say disappointing. "

SOLUTION:
Plural