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: There was an immense scowl on her face.

SOLUTION: Singular

PROBLEM: " Your new teacher, the principal, and Mrs. Groves, from the Superintendent's office.

SOLUTION: Singular

PROBLEM: " But the crop is becoming very temperamental. "

SOLUTION:
Singular