Prepositions before nouns

Using “of” and “in” with “relationship”

Relationship commonly appears with in when talking about being involved in a relationship. Of relationship is uncommon except in larger noun phrases such as “the importance of relationships.”

Quick answer

Which is correct with “relationship”?

Use in a relationship to describe romantic involvement or participation in a relationship. Of relationship is not usually a fixed combination, but of can belong to a larger phrase such as “the value of relationships.”

She has been in a relationship for two years.
The article discussed the importance of relationships at work.
They are in a healthy relationship now.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
in a relationship

Describing romantic involvement

Use in a relationship for someone who has a romantic partner.

He is in a relationship with a colleague.
They have been in a long-distance relationship since May.
2
relationship with + person/group

Naming the other side of a relationship

Use with to identify the connected person or organisation.

She has a strong relationship with her sister.
The company improved its relationship with customers.
3
relationship between + people/things

Showing connection between two sides

Use between when discussing interaction or links.

Researchers studied the relationship between diet and sleep.
The relationship between the two countries improved.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
of relationship
The study examined the nature of relationships at work.
Of usually belongs to another noun such as nature or importance, not directly to relationship.
in relationship
She is in a relationship with Alex.
Standard expression for romantic involvement.
relationship with
He has a close relationship with his mentor.
Shows connection to another person or group.
relationship between
The relationship between stress and sleep is complex.
Used for links between two things.

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using in relationship without an article

The phrase usually needs a before relationship.

✕ She is in relationship now. ✓ She is in a relationship now.

Treating of relationship as a fixed phrase

Of normally connects to another noun in the sentence.

✕ They talked of relationship. ✓ They talked about relationships.

Using with instead of between for two sides

Between is better when two parties are equally linked.

✓ The relationship between the departments improved.

Quick practice

Choose the expression that matches the intended meaning.

1. She has been ___ a relationship for three years.
2. The report explored the relationship ___ exercise and mood.
3. He has a good relationship ___ his manager.

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Frequently asked questions

Is “in relationship” correct?

Usually the natural form is “in a relationship.” The article is important.

Can I say “of relationship”?

Not usually as a fixed phrase. Of generally belongs to another noun, such as “the importance of relationships.”

What preposition is common after relationship?

With and between are very common depending on whether you mention one side or two sides of a connection.

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