Noun Suffixes | Grammar Quizzes
https://www.grammar-quizzes.com/noun-forms.htmlA noun may end in -ing. To test if a word is a noun: (1) put an article before it or (2) a prepositional phrase after it. If not awkward sounding, then the word shares these properties belonging to nouns. NOUN PHRASE (1) ACCEPTS AN ARTICLE: The landing was not difficult. The landings were not difficult. (2) IS SINGULAR OR PLURAL IN AGREEMENT