The document discusses different grammatical forms involving verbs ending in -ing, including gerunds, participles, and other uses after prepositions, verbs, possessive adjectives, and the phrase "there is no". Gerunds can function as subjects, objects of prepositions or verbs. Participles can be progressive forms using a form of "to be". Adjectival participles describe nouns. Verb+ing forms can follow time linkers, "go", possessives, and "there is no". While the infinitive and -ing form sometimes mean the same thing, sometimes they imply different meanings regarding sequence or aspect of the action.