The ing form of the verb is sometimes called the present participle or gerund. We use it for:
1. after verbs which mean like/don't like: like, love, enjoy, dislike, hate, not mind, can't stand.
2. after sone adjectives (bijv. nw) and prepositions (voorzetsels) which say how well people do things or how they feel about doing them: good at, bad at, keen on, interested in, crazy about, afraid of, tired of, ...
3. as part of a subject in a sentence. Most often it can be found at the start of the sentence: Playing online games is very addictive.