When should i +ing after "to"?

[Candyhui]

When should i use" v+ing "after "to"?

help me plz><!!!!!!!!!

[Delfino]

I@d recommend you read the explanations you can finde here:

http://www.englisch-hilfen.de/en/gramma ... initiv.htm

You may also use the exercises to at the end to check your understanding.