We use a verb + -ing: after prepositions, as subjects or objects of a sentence, after the verbs admit, appreciate, avoid, celebrate, consider, delay, deny, dislike, enjoy, finish, imagine, involve, keep, mind, miss, postpone, practise, regret, risk, stop, suggest, after the expressions it's no good, it's not worth, it's no use, it's a waste of time, can't stand, can't bear, can't help.