Is a group of singular or plural?
singular) When the group is being considered as a whole, it can be treated as a single entity: “the group was ready to go on stage.” But when the individuality of its members is being emphasized, “group” is plural: “the group were in disagreement about where to go for dinner.” BUY THE BOOK!
Enough as an adjective.
See below. Enough can qualify count nouns in the plural, or non count nouns (which are by definition in the singular). Enough cannot normally be used to qualify a count noun in the singular.
Group is a noun, singular. Groups is a noun, plural. When speaking about a group of musical artists or performers, the word band is used. e.g.: My favourite band is "Coldplay".
Use is with singular subjects and are with plural subjects. Collective nouns usually take is, but you can use are if you need to emphasize the individuals who belong to the group.
Use the singular if you see the class as a group of students. Use the plural if you see the class as single students. In British English the plural is used more often than in American English.
groups - Simple English Wiktionary.
The word enough can be used as an adjective, an adverb or with a noun. It can even be used as a pronoun. She wasn't tall enough to become a flight attendant. This piece of writing isn't good enough.
Example Sentences
Adverb I couldn't run fast enough to catch up with her. She's old enough to know better. Are you rich enough to retire? That's good enough for me.
We normally only use enough of when it is followed by a determiner or a pronoun (a/an/the, this/that, my/your/his, you/them, etc.). There isn't enough of that bread to make sandwiches for everyone. I've seen enough of his work to be able to recommend him. There's enough of us to make a difference.
Boy is singular. One boy. Boys stands for plural. Multiple Boys.
Is it a group is or a group are?
Technically it should be 'a group is..'. This is because a group is a singular entity in the same way as a company and a school and a class is . . But many people will use the plural 'are' because they are more comfortable with it.
“A group of people” has to be singular, since it is the 'group' that is being talked about. Here, 'group' is a singular collective noun with people as its constituents which are of course plural. So when we talk about 'a group' it is singular, when we say 'two groups', that is clearly plural.

Noun It'll be easier if we go there as a group. She presented the idea to the group.
The intermediate ranking unit between "word" and "clause" on the lexicogrammatical rank scale in Systemic Grammar is generally known as a "group".
Language - Collective Nouns
They said that a football team name can be used as either a singular or plural noun depending on the context. A football team is a group noun or collective noun and there are lots of other examples of these types of nouns.
The collective nouns for students are class, cohort and school.
No,school is countable noun but students,people etc can form a collective nouns e.g. a team of players, a group of people, a group of students etc are collective nouns.
They are normally referred back to using "they", even in those cases when the original antecedent is treated as a singular. Examples: A team, a posse, a council, a fraternity, a silent majority, etc. Human beings are never referred to as it.
A group is said to be countable or denumerable or enumerable if it satisfies the following equivalent conditions: It is countable as a set, i.e., its order is a cardinal that is at most the cardinality of the natural numbers. It has a countable generating set.
Collective nouns can be countable or uncountable, depending on the meaning of the sentence. Collective nouns refer to a group (army, committee, group, government, etc.) Americans tend to use collective nouns as singular nouns: The crowd is cheering.
What is a group of nouns?
A noun group is a group of words relating to, or building on, a noun. Noun groups usually consist of a pointer (the, a, an, this, that, these, those, my, your, his, her, its, our, mum's, Mr Smith's) plus one or more adjectives or adverbs and are an important language resource for building up descriptions.
Both 'its' and 'their' are determiners. 'Its' is singular, and 'their' is plural. So, the basic rule is to use 'its' with singular nouns and 'their' with plural nouns.
A paragraph is a group of sentences that explain and support part of your paper's argument.