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: Things were about to get difficult.

Answer: Plural


Question: A twig snaps behind me.

Answer: Singular


Question: " Yes -- the preliminary tests show that the engines are operating better than we hoped. "

Answer:
Plural