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.

Q: A loud boom shook through the ship, shaking more frost atop them.

A: Singular
****
Q: The rows of houses like headstones in a cemetery.

A: Plural
****
Q: Little bits of debris floated to the top swirling in the eddy left behind from the quick fill.

A:
Plural
****