What is the teacher trying to teach by telling the students to identify group verbs. How is a verb different from a group verb?

Thanks for your help.

I've never heard of "group verbs" although I taught English grammar for many years.

She may have gotten her tongue twisted and means "verb groups."

You shouldn't question the teacher.

group verb: shouldn't question
modal: shouldn't verb: question
That is one way to get a group verb, a modal plus a verb.

Another is to use an auxiliary verb with a verb.
You haven't seen a better teacher in the 4th grade than this.
verb: seen auxiliary: haven't
group verb: haven't seen

http://www.usingenglish.com/glossary/verb-group.html

When a teacher asks students to identify group verbs, they are likely trying to teach them about verb phrases and how they function in a sentence.

A verb is a word that expresses an action, occurrence, or state of being in a sentence. It is an essential component of a sentence because it helps convey the main idea or action. Examples of verbs include "run," "eat," "sleep," "play," etc.

On the other hand, a group verb, also known as a verb phrase, consists of a main verb and one or more helping verbs (also called auxiliary verbs). The helping verbs assist the main verb to convey additional information such as tense, mood, voice, and so on. For example, in the sentence "She is studying for her exams," the verb phrase "is studying" consists of the helping verb "is" and the main verb "studying."

Identifying group verbs helps students understand the complex structure and formation of sentences. It allows them to distinguish between a simple verb and a verb phrase, helping them recognize how auxiliary verbs contribute to the overall meaning of a sentence. This knowledge is essential for building grammatically correct and meaningful sentences.