I forgot the term for does , do , have , will , etc. — besides to be (am, is, are, ...) — when it is formed as a proper question . Hence I asked both ChatGPT and Gemini. 👍 It is known as auxiliary verb inversion . As it involves swapping the auxiliary verb from its usual position in the sentence. Affirmative declarative to proper question examples: You eat ➡️ Do you eat? I have showered ➡️ Have I showered? That horse will neigh ➡️ Will that horse neigh? When it is used in proper question, the do , have , and will function as auxiliary verbs in inversion . It falls under the broader category of subject-auxiliary inversion . There's no clear term for that final swapped auxiliary verb. Only the method (or process), auxiliary verb inversion . So, I call it inverted auxiliary verb. 😂 Which sounds like DOES becomes SEOD . Nay-nay form (negative declarative) to improper question: She does not like to smile ➡️ Seod sh...