Prepositions after adjectives

Intent on, upon, in or of?

The standard expression is intent on followed by a noun or -ing form. Intent upon is a formal variant. Intent in and intent of are usually not standard combinations after the adjective intent.

Quick answer

Which preposition follows intent?

Use intent on to describe strong focus or determination: intent on winning. Intent upon has the same meaning but sounds more formal or literary. Intent in is generally used only when in introduces a separate phrase such as a place or activity. Intent of is not a standard adjective pattern.

She was intent on finishing the report.
The child seemed intent upon the game.
He looked intent in conversation.

Choose the pattern by meaning

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

intent on + noun

Showing determination or concentration

Use intent on with a noun to describe strong focus on a goal or activity.

The company is intent on expansion.

She remained intent on success.

intent on + -ing form

Showing determination to do something

Use intent on followed by an -ing verb for planned or determined action.

They are intent on improving customer service.

He seemed intent on proving his point.

intent upon + noun or -ing form

Using a formal alternative

Intent upon has the same meaning as intent on but is more formal and less common in everyday speech.

She was intent upon her studies.

The group appeared intent upon finding a solution.

intent in + activity or setting

Using in as a separate adjunct

In can introduce the situation where someone appears intent, but it is not the normal adjective-preposition pattern selected by intent.

He sat quietly, intent in thought.

She looked intent in conversation.

See the difference in context

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

Construction

Example

Meaning

intent on

He is intent on winning the contract.

Standard and common expression for determination or concentration.

intent upon

She was intent upon solving the problem.

Formal variant of intent on.

intent in

The child was quiet, intent in play.

In introduces the activity or situation, not a standard fixed combination.

intent of

They were intent on leaving early.

Intent of is generally nonstandard after the adjective intent. Use intent on instead.

Common mistakes

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

Using intent of instead of intent on

After the adjective intent, on is the standard choice.

✕ She is intent of changing the rules. ✓ She is intent on changing the rules.

Confusing formal upon with unrelated usage

Upon is acceptable but more formal than on.

✕ The team was intent upon to win. ✓ The team was intent upon winning.

Adding an infinitive after intent on

Use a noun or -ing form after intent on.

✕ He is intent on to finish quickly. ✓ He is intent on finishing quickly.

Quick practice

Choose the expression that matches the intended meaning.

1. She is intent ___ becoming a doctor.

2. The detective seemed intent ___ the evidence.

3. He sat silently, intent ___ thought.

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Frequently asked questions

Is intent upon old-fashioned?

It is still correct but sounds more formal or literary than intent on.

Can I say intent to do something?

Yes, but that uses intent as a noun, as in his intent to leave.

Why do I sometimes see intent in thought?

In thought describes the situation or mental state. It is different from the fixed pattern intent on something.

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