I think there are no rules for that. TO is usually followed by infinitive, but there are some exceptions as the ones you have written and for example: be used to + -ing get used to + -ing
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CalifJim"to" can often be seen to be a preposition if there is another usage where the "to" is followed by a noun.Do you think, CJ, that this is a good 'rule' to shorten the problem of memorizing when it's preposition and when it's not? I mean, how much does it cover, 50, 70 or 90% of the cases?