On the basis that it is better not to split the infinitive, the second one may be considered preferable. ) For me, there is also a subtle issue of meaning or emphasis that causes me to prefer the second.
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tamguatlayThanks, GPY. For me, there is also a subtle issue of meaning or emphasis that causes me to prefer the second. - Could you please elaborate on this?"never to do something" better expresses (for me) the absence of action.
tamguatlaycorrect sentence ...?This one: He promised never to do it again.