contestada

Hi !

I'm Brazilian and I do not speak English, so I'm sorry for my bad grammar: /

I have a question: when do I have to put the "to" behind a verb?
I see a lot of verbs that do not have the "to" behind it.
And also has verbs that have an "ing" at the end. Why do I have to put
"Ing" and not "to"?

Can someone help me ?

Thank you very much! :]