you use Gerund if you see those words: miss, avoid, understand, regret, keep, enjoy, suggest etc. Inf: offer, hope, wait, want, decide, agree and etc.)))

Gerund is just adding -ing to an infinite verb watch~>watching help~helping pour~>pouring Some verbs change when in gerund form but only slightly love~>loving hope~>hoping trade~>trading If the verb ends in -e drop it and add -ing, an exception is verbs that end in double e's lik agree, just add -ing i.e. agreeing (i.e. means that is)