Cambridge records “insist on something/doing something” for demanding or continuing an action. “Insist to do” is not the parallel direct-complement pattern. Other valid insist patterns include “insist that …” and “insist on” followed by a noun phrase; this guide is only about the direct action complement.
ReviewedEvidence1 sourceSectionEnglish Usage
Quick answer
Use “insist on doing” when insist is followed directly by the action someone demands or persists in doing; “on” is part of the construction and the action takes an -ing form.
Key details
Confusion Familygrammar-and-usage distinction
Rule Familypreposition and verb-complement pattern
TermsInsist On Doing, Insist To Do
Further guidance
Boundary
Other valid insist patterns include “insist that …” and “insist on” followed by a noun phrase; this guide is only about the direct action complement.
Construction
Cambridge records “insist on something/doing something” for demanding or continuing an action. “Insist to do” is not the parallel direct-complement pattern.
Decision
Use “insist on doing” when insist is followed directly by the action someone demands or persists in doing; “on” is part of the construction and the action takes an -ing form.
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 records “accuse someone of something” and specifically “accuse someone of doing something.” That supports of + -ing when the action is the alleged wrongdoing.
Cambridge records accustomed to something and gives -ing examples such as being accustomed to working or being treated in a particular way. Do not interpret the “to” after accustomed as an infinitive marker in this construction.
Cambridge distinguishes adapt to a situation or activity from transitive patterns such as adapting plans to fit new circumstances. The surface sequence “adapt … to + verb” therefore needs its grammatical structure identified before choosing an -ing form or infinitive.
Cambridge distinguishes “apologize to someone” from “apologize for something/doing something.” You can combine the two roles, as in “apologize to someone for doing something”; “to” marks the recipient while “for” marks the reason.
Cambridge distinguishes intransitive “approve of” for a favorable opinion from transitive “approve something” for official acceptance or authorization. The official-authorization sense uses transitive “approve” with an object; do not collapse that separate sense into the “approve of doing” judgment pattern.
Oxford documents the person-action pattern as be banned + from + -ing and separately documents direct-object uses of ban. The cited evidence does not support person + to-infinitive as the equivalent prohibition construction.
