Here's a breakdown:
* Helping verbs assist the main verb in forming different tenses, moods, or voices. Examples include: *be, do, have, will, would, can, could, should, might, may*.
* Auxiliary verbs are a broader term that encompasses helping verbs and other verbs that help form verb phrases. For instance, the phrase "has been working" includes the auxiliary verbs "has" and "been" along with the main verb "working."
* Modal verbs are a specific type of auxiliary verb that express possibility, obligation, necessity, or permission. Examples include: *can, could, may, might, must, shall, should, will, would*.
Examples:
* Helping verb: *She has been studying for her exams.*
* Auxiliary verb: *They are going to the park.*
* Modal verb: *You should take a break.*
Let me know if you'd like more examples or have other grammar questions!