“Agree to do” expresses consent to take an action. An -ing form normally follows a preposition in patterns such as “agree with doing,” which expresses approval rather than the direct promise-to-act construction.
ReviewedEvidence2 sourcesSectionEnglish Usage
Quick answer
Use “agree to do” when someone consents to perform an action; use “agree with doing” when approving an action or idea. Bare “agree doing” is not the same pattern.
Key details
Confusion Familygrammar-and-usage distinction
Rule Familyverb complement pattern
TermsAgree Doing, Agree To Do
Further guidance
Decision
Do not collapse agree to do and agree with doing into a simple gerund-versus-infinitive swap because the construction and meaning differ.
Preposition Boundary
Use agree with + -ing when the point is approval of an action or practice; the -ing form belongs to the prepositional construction.
To Infinitive
Use agree + to-infinitive for consenting or undertaking to perform 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.
Cambridge documents both admit + -ing and admit to + -ing for acknowledging something. Other passive patterns such as “be admitted to be” are separate constructions.
Both patterns are standard. “Advise waiting” recommends an action generally or in context, while “advise him to wait” names the person who is advised to perform it. A that-clause is another standard option.
When “afford” is followed directly by another verb, standard learner references use a to-infinitive: “afford to do.” An -ing form can appear elsewhere in a sentence, but it is not a like-for-like direct complement after “afford.”
Cambridge documents aim + to-infinitive for intention and aim at for directing effort toward an objective. Do not omit the preposition and present bare “aim doing” as equivalent to “aim to do.”
“Allow” can take an activity as its object, as in “allow smoking,” or a person/thing followed by a to-infinitive, as in “allow visitors to enter.” The patterns answer different structural questions: what is allowed versus who is allowed to do what.
Cambridge describes appear as a linking verb and with a to-infinitive; a progressive action can sit inside that infinitive, as in “appears to be working.” An -ing form after appear can belong to another structure or sense, so “appear doing” is not a free alternative to “appear to do.”
