Hi, In the "looking forward to seeing you" the word 'to' is a preposition (not the particle 'to' of the infinitive 'to see') and as such is always followed by a pronoun, noun or noun equivalent, for example a noun clause. Here, the preposition 'to' is followed by the gerund (a verbal noun).
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sane1looking forward to see youI haven't seen a really good explanation either, but I'm sure one exists somewhere.
Could someone please explain to me when exactly you have to add "ing" after "to"?
CalifJim The -ing form is used with all prepositionsAfter racking my brain unsuccessfully for a counterexample, I was about to ask you if there might be such a "rule."