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:
The ambassador was an ally and friend, who owed his post in Washington, D.C. to the Owl's influence and discreet lobbying.
answer:
Singular


question:
The dog promptly dropped to a sitting position, his tail still wagging furiously.
answer:
Singular


question:
There were several other couples, all of whom slid over to make room for the four new people.
answer:

Plural