Final answer:
In American English, the rule for a singular collective noun is to use a singular verb when referring to the group as a whole, and a plural verb when referring to individuals within the group.
Step-by-step explanation:
The agreement rule for a singular collective noun in American English is as follows: Use a singular verb if the collective noun is referring to the group as a whole; use a plural verb if the collective noun is clearly referring to unique individuals within the group. Here are a couple of examples to illustrate this:
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To provide clarity when the group members are acting individually, it is common to add the word 'members' and use a plural verb. For example:
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