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: Their shared orgasm left them spent and still connected, hugging each other while their breathing slowly returned to normal.

SOLUTION: Singular

PROBLEM: The two makeup authorities finally finished, stood back clucking in admiration of their work, and beamed at Alani.

SOLUTION: Plural

PROBLEM: The trains that everyone had once thought were dead had now leapt back into life.

SOLUTION:
Plural