The word “to” is often confusing in English. It can be used as part of a modal expression, infinitive or as a preposition.

Note the usage of “to” in the following sentences.

To V I used to live in Utah. I am supposed to go. I hope to see you.

To V ing I am used to living in Utah. I am opposed to going. I look forward to seeing you.

Modal expressions are always followed by the base form of the verb.

ought to have to have got to used to

be to be able to be supposed to be going to

Similar expressions are followed by infinitives (to + V)

need to V want to V hope to V happen to V mean to V tend to V care to V wish to V would like to V

be allowed to V be inclined to V be reluctant to V be willing to V be happy to V be afraid to V be required to V be delighted to V be compelled to V

Many prepositional combinations using “to” are followed by gerunds.

look forward to V ing resort to V ing submit to V ing confess to V ing give in to V ing admit to V ing with regards to V ing

be accustomed to V ing be addicted to V ing be opposed to V ing be limited to V ing be dedicated to V ing be commited to V ing be used to V ing