The basic rule is:
* Singular subject: Takes a singular verb.
* Plural subject: Takes a plural verb.
Example:
* Incorrect: The group of students are going on a field trip.
* Correct: The group of students *is* going on a field trip.
Explanation:
* "Group" is the singular subject.
* The phrase "of students" modifies the subject, but doesn't change its grammatical number.
* Therefore, the verb should be "is" (singular).
Remember:
* Focus on identifying the actual subject and its number.
* Don't get distracted by the words in between.
Let me know if you'd like more examples or have any other questions!