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: All the bearded hunter could do was stare wide-eyed.

SOLUTION: Singular

PROBLEM: I can't float it up now, the turbulence up there must be terrific !'

SOLUTION: Singular

PROBLEM: Its companions looked on with a frightening apoplexy.

SOLUTION:
Plural