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: The ladies were sitting there watching Chet and Mark tie the lines.

SOLUTION: Plural

PROBLEM: The seats are empty but I still hear the songs.

SOLUTION: Plural

PROBLEM: At the microscopic level, the anomalous tissue differed greatly from ordinary lung.

SOLUTION:
Singular