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.
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Question: The off-duty homicide investigator put her napkin on the table, not realizing the impact of her words on the latecomers.

Answer: Singular


Question: There's a mumbling from the heap.

Answer: Singular


Question: The insects had shifted easily to let Boots by, but they were an obstacle course for him.

Answer:
Plural