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 man-made chemical polonium leaks from the engines by tiny droplets.

SOLUTION: Singular

PROBLEM: The networks would have picked it up in a minute. "

SOLUTION: Plural

PROBLEM: That ferry will be leaving at 5 PM. "

SOLUTION:
Singular