Preposition after adjective

Interested in

The adjective 'interested' is normally followed by 'in' to show a topic, activity, or subject that attracts someone's attention.

Quick answer

When to use 'interested in'

Use 'interested in' to talk about curiosity, attention, or enthusiasm for a subject, activity, person, or opportunity.

She is interested in marine biology.
Are you interested in joining the project?
He became interested in photography at university.

Choose the pattern by meaning

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

1
interested in + noun

Talking about a subject or thing

Use 'interested in' before a noun to name the thing that attracts attention or curiosity.

I'm interested in modern architecture.
They are interested in local politics.
2
interested in + -ing form

Talking about activities

Use 'interested in' with an -ing form to describe activities someone enjoys or wants to do.

She's interested in learning Japanese.
We're interested in working abroad.
3
interested in + person

Talking about personal or romantic interest

Use 'interested in' to show attraction, concern, or curiosity about a person.

He seems interested in her research.
I think she's interested in him.
4
be interested in + question word clause

Asking about information

You can use 'interested in' before clauses beginning with words such as 'how', 'why', or 'what'.

They're interested in how the system works.
I'm interested in why sales increased.

See the difference in context

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

Construction
Example
Meaning
interested in
She is interested in astronomy.
Standard form used for topics, activities, or people that attract attention or curiosity.
interested to + verb
I was interested to hear your opinion.
Different structure meaning someone reacted with interest to new information.
interesting to
The article was interesting to young readers.
Describes what another person finds engaging.
interested about
Many learners say 'interested about the topic', but standard English uses 'interested in the topic'.
Usually nonstandard when naming the object of interest.

Common mistakes

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

Using 'about' instead of 'in'

After the adjective 'interested', English normally uses 'in' for the topic or activity.

✕ She is interested about art. ✓ She is interested in art.

Using an infinitive after 'interested in'

Use an -ing form after 'interested in', not 'to' + verb.

✕ I'm interested in to learn coding. ✓ I'm interested in learning coding.

Confusing 'interested' and 'interesting'

'Interested' describes feelings. 'Interesting' describes the thing that creates interest.

✕ I'm interesting in history. ✓ I'm interested in history.

Quick practice

Choose the expression that matches the intended meaning.

1. He is interested ___ environmental science.
2. We're interested in ___ abroad next year.
3. I was interested ___ hear the results.

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Frequently asked questions

Can I say 'interested about'?

In standard English, 'interested in' is the usual form for topics and activities. 'Interested about' is generally avoided.

What is the difference between 'interested in' and 'interested to'?

'Interested in' introduces a topic or activity. 'Interested to' is usually followed by a verb and describes a reaction to hearing, seeing, or learning something.

Can 'interested in' be used with people?

Yes. It can describe curiosity, professional attention, or romantic attraction toward someone.

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