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: " Those aliens attacked us, and earth was destroyed because of what they did.

SOLUTION: Plural

PROBLEM: ' My servants have all deserted me, but my little pets are still faithful.'

SOLUTION: Plural

PROBLEM: His first attempts resulted in mere fragments, so he used his hunting knife to dig one out.

SOLUTION:
Plural