TO V or not to V

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	To V ing
I used to live in Utah.	I am used to living in Utah.
I am supposed to go.	I am opposed to going.
I hope to see you.	I look forward to seeing you.

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

ought to	be to
have to	be able to
have got to	be supposed to
used to	be going to

Similar expressions are followed by infinitives(to+V)

need to V	be allowed to V
want to V	be inclined to V
hope to V	be reluctant to V
happen to V	be willing to V
mean to V	be happy to V
tend to V	be afraid to V
care to V	be required to V
offer to V	be eager to V
seem to V	be anxious to V

Many prepositional combinations using "to" are followed by gerunds

look forward to Ving	be accustomed to Ving
resort to Ving	be addicted to Ving
submit to Ving	be opposed to Ving
confess to Ving	be limited to Ving
give in to Ving	be dedicated to Ving
admit to Ving	be committed to Ving

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