in a group
Working or acting together
Use in a group for participation within a set of people.
The task was completed in a group.
How to use prepositions with group
Group often appears with in and of, but the structure and meaning are different.
Quick answer
Using in group and of group
In a group means as part of a collection of people or things. Of a group identifies membership or relation. English usually needs an article before group in these expressions.
We worked in a group of four students.
She is part of the group leading the project.
The students sat in groups around the room.
She is part of the group leading the project.
The students sat in groups around the room.
Choose the pattern by meaning
These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.
part of the group
Showing membership
Of links a person or thing to a group they belong to.
He became part of the group last month.
group of + plural noun
Describing a collection
Group of introduces the members inside the group.
A group of tourists arrived early.
in groups
Arranging people into sets
The plural form describes several groups.
The children worked in groups during the lesson.
See the difference in context
The same subject can take different constructions because each sentence answers a different question.
Construction
Example
Meaning
in group
The phrase in group is uncommon without an article; English usually says in a group or in groups.
Needs an article or plural form in most contexts.
of group
Of group alone is not idiomatic; use part of the group or group of students.
Of normally appears in a larger structure with group.
in a group
They travelled in a group for safety.
Standard expression for acting together.
group of
A group of researchers published the report.
Standard way to describe members of a collection.
Common mistakes
Some combinations appear in real text but do not mean what learners often assume.
Leaving out the article
Singular group usually needs a or the.
✕ She works in group. ✓ She works in a group.Using of group by itself
Of needs a fuller structure.
✕ He is of group. ✓ He is part of the group.Confusing group of and groups of
Use the singular or plural depending on quantity.
✕ Groups of student entered the hall. ✓ Groups of students entered the hall.Quick practice
Choose the expression that matches the intended meaning.
1. The students worked ___ a group.
2. She became part ___ the group.
3. A group ___ engineers visited the site.
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Frequently asked questions
Is in group correct?
Usually English says in a group or in groups rather than in group.
Can I say of group?
Not by itself. Use a fuller expression such as part of the group or group of students.
What is the difference between in groups and in a group?
In a group refers to one group, while in groups refers to several separate groups.
Related preposition guides
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