Promise Doing vs. Promise To Do
“Promise to do” is the standard pattern for committing to perform an action. The verb also occurs with noun objects and clauses, so those alternatives should be distinguished from a supposed direct gerund complement.
Use “promise to do” when committing yourself to an action. Direct “promise doing” is not the standard equivalent; “promise” also supports noun and clause patterns.
Key details
Choose the right form
| Meaning / situation | Form / construction | Decision |
|---|---|---|
| commit yourself to performing a following action | promise + to-infinitive | Use the standard action complement. |
| promise a thing | promise + noun object | A noun can be the object of “promise.” |
| state the content of a promise as a clause | promise + that-clause / other content clause | This is a separate documented complement type, not direct promise + -ing. |
Quick tests
Meaning / construction test
Is the following verb the action the subject commits to perform?
If yes: Use “promise to do.”
If no: If you are promising a thing or stating the promise as a clause, use the corresponding noun or clause pattern.
Examples
She promised to call before noon.
A promised action takes the to-infinitive.
They promised a full reply.
A noun phrase can be the object of “promise.”
He promised that he would return the key.
A clause can state the content of the promise.
Further guidance
Decision
For a promised action expressed as a following verb, choose the to-infinitive.
Other Patterns
Promise also occurs with noun objects and content clauses; those are separate complement patterns rather than evidence for direct promise + -ing.
To Infinitive
Use promise + to-infinitive when the subject commits to performing an 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.
- promise — Oxford Advanced Learner’s Dictionary (opens in a new tab)Oxford Learner’s Dictionaries · Promise with to-infinitive, object and clause patterns
- Verb patterns: verb + infinitive or verb + -ing? (opens in a new tab)Cambridge Dictionary · Verb-complement patterns, including verbs taking -ing, to-infinitive, or both with meaning differences