1. When a verb is the subject of another verb:
E.G: Smoking is bad for health.
2. After a preposition we use, -ing form:
E.G: I´m tired of studing.
3. After some verbs:a) Preference verbs:
Like, Love, Prefer, Can´t stand.
E.G: I love playing football.
b) After suggest, miss, be sick of, practise, finish.
E.G: Emi suggested writing a blog.
;)


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