TASK DEFINITION: In this task you are given a sentence. You must judge whether the object of the main clause is singular(like: apple) or plural(like: apartments). Label the instances as "Singular" or "Plural" based on your judgment.
PROBLEM: You still have unresolved issues surrounding your brother's death.

SOLUTION: Plural

PROBLEM: Although we work in the same office, my husband usually keeps his suspicions to himself.

SOLUTION: Plural

PROBLEM: ' They have been concentrating their efforts on building up forces in preparation for D-Day, which didn't happen.

SOLUTION:
Plural