Be Busy Doing vs. Busy To Do

Key details

Confusion Familyverb complement choice

Rule Familyverb complement licensing

TermsBe Busy Doing, Busy To Do

Choose the right form

Decision table for Be Busy Doing vs. Busy To Do
Meaning / situation	Construction	Decision
activity occupying someone	busy + -ing	name the activity taking the time/attention
busyness prevents another action	too busy to + verb	use the degree construction with “too”
bare busy + to-infinitive	busy to + verb	do not use as a direct substitute for busy + -ing

Quick tests

Occupied-or-prevented test

Are you naming the activity someone is occupied with, or saying busyness prevents another action?

If yes: Use “busy + -ing” to name the occupying activity.

If no: Use “too busy to + verb” when the intended meaning is inability because of busyness.

Caveat: “Busy doing” and “too busy to do” are different constructions, not stylistic variants.

Examples

Example

She is busy preparing the report.

The -ing phrase names the activity occupying her.

Example

She is too busy to answer now.

The “too … to” construction says busyness prevents the action.

Incorrect

She is busy to prepare the report.

Better: She is busy preparing the report.

Use the documented “busy + -ing” activity construction.

Further guidance

Boundary

Busy doing and too busy to do are different constructions with different meanings. Do not treat bare busy to do as a direct alternative to busy doing.

Construction

Cambridge directly documents busy + -ing for being occupied with an activity, and separately documents too busy to do something.

Decision

Use be busy + -ing for the activity occupying someone; use too busy to + infinitive only for the distinct meaning that busyness prevents another action.

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.

busy (opens in a new tab)Cambridge University Press & Assessment · Preferred lexical authority directly documenting busy doing something and the distinct too busy to do something construction.

Related guides

English Usage

Accustom Yourself To Doing vs. Accustom Yourself To Do

Cambridge directly gives accustom yourself to followed by an -ing form for becoming familiar with new conditions. The to belongs to the prepositional construction accustom yourself to something; do not infer an equivalent to-infinitive from the surface word to.

English Usage

Apply Yourself To Doing vs. Apply Yourself To Do

Oxford documents apply yourself to (doing) something for working hard and attentively at a task. This apply-yourself construction takes prepositional to; other senses of apply use different complements and should not be merged into this pattern.

English Usage

Be Capable Of Doing vs. Capable To Do

Cambridge directly documents capable of something/doing something for having the ability, power, or qualities needed to do something. The documented adjective complement is capable of + noun or -ing form; do not replace the prepositional complement with capable to + infinitive on the basis of meaning alone.

English Usage

Be Good At Doing vs. Good To Do

Cambridge directly documents be good at something/doing something for being skilled or successful at an activity. Good to + infinitive can occur in other constructions and meanings, but it is not a substitute for the documented skill construction be good at + -ing.

English Usage

Be Reduced To Doing vs. Be Reduced To Do

Oxford directly documents reduce somebody/something to (doing) something, usually in the passive, for being forced into a worse state or action. Here to introduces the resulting state or activity; the authority does not establish an equivalent be reduced to + bare infinitive pattern.

English Usage

Be Skilled At Doing vs. Skilled To Do

Cambridge directly documents be skilled at/in doing something for having developed ability in an activity. The preferred-source construction uses a preposition before the -ing form; do not infer skilled to + infinitive as a parallel complement solely from the adjective’s meaning.

Explore the topic

Grammar Verb Forms