Hi Ramin,
In general, we use to with verbs in the infinitive form (base form). For example, "to go", "to run", to "examine" are all correct. There are, however, some exceptions.
1) I am looking forward to seeing you.
2) I am used to working long hours.
3) I prefer dancing to walking.
These are some exceptions that are commonly encountered when using the word "to".
Hope this helps.
Cheers, Lance