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Prepositions after adjectives

busy with or busy in?

Busy with is the usual expression for tasks or activities. Busy in is less common and normally refers to activity within a place or field.

Quick answer

Busy with vs. busy in

Use busy with for tasks, work, or objects receiving attention. Busy in can describe involvement within an area, field, or place, but it is less common.

She is busy with her homework.
They were busy with preparations for the event.
He has been busy in local politics.

Choose the pattern by meaning

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

1
busy with + task/object

Talking about work or activity

Busy with is the standard pattern for tasks, projects, or responsibilities.

I am busy with a client meeting.
2
busy in + field/activity

Describing involvement in an area

Busy in can refer to activity within a profession, field, or organisation.

She is busy in community work.
3
busy in + place

Showing activity inside a location

Busy in may also describe someone active in a particular place.

The staff were busy in the warehouse.
4
busy with + person/object

Giving attention to someone or something

Busy with can show what occupies someone's time.

He is busy with the new software system.

See the difference in context

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

Construction
Example
Meaning
busy with
She is busy with a report.
occupied by a task or responsibility
busy in
He is busy in financial research.
active within a field or area
busy at
They are busy at work.
at introduces a place or activity, not a fixed adjective pattern
busy on
She is busy on a new project.
common informal alternative to busy with for projects

Common mistakes

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

Using busy in for ordinary tasks

Busy with is more natural for specific tasks and duties.

✕ I am busy in my homework. ✓ I am busy with my homework.

Omitting the preposition

Busy normally needs a preposition before the activity or object.

✕ She is busy the presentation. ✓ She is busy with the presentation.

Using busy with for fields of activity

For long-term involvement in an area, busy in may fit better.

✕ He is busy with academic research these days. ✓ He is busy in academic research these days.

Quick practice

Choose the expression that matches the intended meaning.

1. She is busy ___ a marketing report.
2. He has been busy ___ environmental activism.
3. The technicians are busy ___ the lab.

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Frequently asked questions

Which is more common: busy with or busy in?

Busy with is much more common for everyday tasks and responsibilities.

Can I say busy on a project?

Yes. Busy on is common in informal English for projects or assignments.

Is busy in incorrect?

No. It is acceptable when referring to involvement in a field, activity, or place.

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