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: Flames burned high in shades of grey and white.

SOLUTION: Plural

PROBLEM: Part of it is because you are, simply put, really great at what you do..

SOLUTION: Singular

PROBLEM: All the teachers he knew complained about their pay, and most looked for other ways to augment their income.

SOLUTION:
Plural