In general:

Verb+ Preposition+  Ing verb

Adjective+ Preposition+ ING Verb

Noun+ Preposition + ING verb


Word  using 'to' as a preposition

Look forward to + -ing 

I look forward to hearing from you 


admit to + ING

Yes, I admit to being the best Accountant

Object to - dislike

I object to people throwing litter in the streets.

Be used to +ing

I am used to having a cup of tea before leaving for work.

Prefer doing x to doing Y 

I prefter cycylin to Hiking.

Get round to +Ing- do smothig after wanting for for long time

I have finally got round to making this video for Paola.


When 'to' is NOT a preposition, it's usually followed by an  infinitive. 

Verb patterns

want, need, would like+ infinitive

I would like to go. I want to go. I need to go. 

 

In general, after an adjective, use to + Infinitive verb