TASK DEFINITION: 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.
PROBLEM: Flames burned high in shades of grey and white.

SOLUTION: Plural

PROBLEM: But immortality is such a great gift that it would only be bestowed on an individual who had something very precious to offer.'

SOLUTION: Singular

PROBLEM: But the sergeant, perched in the turret of the armoured car trundling along in the rear, gave her a warning grimace.

SOLUTION:
Singular