TASK DEFINITION: In this task you are given a sentence. You must judge whether the object of the main clause is singular(like: apple) or plural(like: apartments). Label the instances as "Singular" or "Plural" based on your judgment.
PROBLEM: At times, she could see his lips tightening, but each time he would control himself and let her continue.

SOLUTION: Singular

PROBLEM: Suddenly he heard the echo of footfalls against his marble floors.

SOLUTION: Singular

PROBLEM: " We're having twins. "

SOLUTION:
Plural