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: What if the authorities hadn't bought the story ?

SOLUTION: Plural

PROBLEM: Several minutes later, footsteps sounded across the wooden floor, and Noah joined me at the window.

SOLUTION: Plural

PROBLEM: " I do, " Soma calmly replied.

SOLUTION:
Singular