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:
Then the vigil began.
answer:
Singular


question:
" Flight # 408 now loading at gate 4B on the north concourse, " came over the loudspeaker.
answer:
Singular


question:
There were two possible versions of this answer.
answer:

Plural