English UsageComparison guide

Discover Someone Doing vs. Discover Someone Do

Discover can take object + -ing when someone is found engaged in an activity. A bare infinitive after that object is not the ordinary parallel pattern for this discover-in-the-act sense.

Reviewed2026-09-27Evidence1 sourceSectionEnglish Usage

Quick answer

Use “discover someone doing something,” not bare “discover someone do,” when you find the person engaged in an activity.

Key details

Confusion Familygrammar-and-usage distinction

Rule Familyverb-complement and object pattern

TermsDiscover Someone Doing, Discover Someone Do

Choose the right form

Decision table for Discover Someone Doing vs. Discover Someone Do
Meaning / situation	Form / construction	Decision
you find a person engaged in an activity	discover someone doing something	Use object + -ing for the activity found in progress.
you discover a proposition or fact	discover that + clause	Use a clause for the discovered fact.
a bare object + base verb is proposed for the activity sense	do not use discover someone do as the parallel pattern	Choose the documented -ing construction.

Quick tests

Meaning / construction test

Did you find the person while they were engaged in the activity?

If yes: Use “discover someone doing …”.

If no: If what you discovered is a fact rather than an activity in progress, use another documented construction such as a that-clause.

Caveat: “Discover” has other valid complements, including that-clauses and some passive constructions. This guide addresses the activity-found-in-progress pattern only.

Examples

Example

They discovered a contractor using the wrong file.

The person was found engaged in the activity, so object + -ing fits.

Example

We discovered that the form was outdated.

A that-clause states the fact that was discovered.

Example

She discovered the children drawing on the boxes.

The -ing phrase names the activity found in progress.

Further guidance

Boundary

Discover also takes that-clauses and passive object + to-be/to-have patterns in other senses; keep those separate from the activity construction.

Construction

Oxford directly records discover + object + -ing in the relevant finding sense.

Decision

Use the -ing form for the activity found in progress; choose another documented discover construction when the intended meaning differs.

Sources and evidence

Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.

discover — Oxford Advanced Learner’s Dictionary (opens in a new tab)Oxford Learner’s Dictionaries · Discover + object + -ing for finding someone or something engaged in an activity

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