instruction:
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.
question:
Washoe's progress with ASL was rapid ; by 1971, she had a vocabulary of 160 signs, which she used in conversation.
answer:
Singular

question:
What are the chances the link will hold ? "
answer:
Plural

question:
Her spine straightened until the woolen blanket fell from her shoulders.
answer:
Singular