Final -s Inside This Chapter Begin here to navigate through each section. Pretest Your Writing: Describing How a Mood Influences Behavior Recognizing Final -s Using Final -s on Plural Nouns Using Final -s for Present Tense Verbs Review & Practice Part 1 and Part 2 Fun with Grammar Return to Your Writing Mastery Test on Final -s Final -s causes confusion because it has different meanings in standard English. The -s on the end of a verb usually marks a singular form, whereas -s on the end of a noun usually marks a plural form. To complicate matters further, the spelling of some words (such as loss and gas) includes an -s ending that carries no grammatical information at all. Understanding the uses of final -s will help you to apply the grammatical markers clearly in your writing. Chapter 11 helps you to distinguish among three -s endings and to use them correctly: natural -s (built into the spelling of some words) plural -s on nouns third person singular present tense -s on verbs.