An -ing verb can either be a present participle (like you see in continuous tenses) or a gerund (the verb functions as a noun). When it's a gerund, it follows "to" as an object. As a present participle, it never follows "to". The simple way of finding out if it is correct is to remove the gerund and replace it with another noun. I look forward to seeing you. I look forward to your answer. I look forward to the holidays. Other online examples (all gerunds): Quentin Tarantino is violently opposed to discussing violence. Ten steps to finding your next job. Loud rock music contributes to hearing loss.

I guess it's not a very common use. Except for expression such as "I look forward to hearing from you" or things like that... Anyway, it doesn't sounds very well!

I am not sure when that would be the case. I would understand a present participle (ing word) coming before the preposition "to", but the other way around doesn't make much sense. For example, "I am to running...," doesn't sound right to start of a sentence with, but, "I am running to...," is a good way to indicate that you are running somewhere. An afterthought, something like, "I am wanting to tell you something," makes sense. It is usually used when you add a present participle before an infinitive verb. If you are putting "to" after an "ing verb", then another unconjugated verb must follow it. For example, "want(ing) (to go)", "try(ing) (to leave)", etc.

An afterthought, something like, "I am wanting to tell you something," makes sense. It is usually used when you add a present participle before an infinitive verb. If you are putting "to" after an "ing verb", then another unconjugated verb must follow it. For example, "want(ing) (to go)", "try(ing) (to leave)", etc.