Here's the breakdown:
When a collective noun is considered a single unit:
* The collective noun takes a singular pronoun.
* This is the most common usage.
Examples:
* The team has finished its work. (The team is one entity)
* The flock of birds is flying south for its winter migration. (The flock is one group)
When a collective noun is considered a group of individuals:
* The collective noun takes a plural pronoun.
* This usage emphasizes the individual members of the group.
Examples:
* The team are all putting their best effort into the game. (Focus on the individual players)
* The jury are all deliberating and have reached their verdict. (Focus on the individual jurors)
In conclusion:
The choice of pronoun depends on whether you are treating the collective noun as a single entity or a collection of individuals.
It's always a good idea to consider the context and what you want to emphasize!