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  1. Auxiliary Verbs: Definition and Examples - Grammarly

  2. Auxiliary Definition & Meaning - Merriam-Webster

  3. Auxiliary Verbs: Explanation and Examples - Grammar Monster

  4. What Is an Auxiliary Verb? | Definition & Examples - Scribbr

  5. What Are Auxiliary Verbs? (Including Examples and Usage)

  6. Auxiliary verb - Wikipedia

  7. Auxiliary Verbs - English Grammar