What are all the auxiliry verbs?

It's not accurate to say there's a definitive list of "all" auxiliary verbs. This is because the category can be somewhat fluid, and the number of verbs considered auxiliary varies depending on the specific grammatical framework.

However, here are the primary auxiliary verbs commonly recognized in English grammar:

Be

* am, is, are, was, were, been, being

Have

* have, has, had, having

Do

* do, does, did, done, doing

Will

* will, would, shall, should

These verbs are often used in combination with main verbs to create complex verb phrases. They serve various functions, including:

* Forming tenses: "I *am* walking" (present continuous), "They *had* finished" (past perfect)

* Expressing modality: "I *will* go" (future), "You *should* study" (obligation)

* Forming questions: " *Do* you like coffee?"

* Forming negatives: "I *don't* know."

Additionally, there are other verbs sometimes considered auxiliary in specific contexts:

* Used to: "I *used to* live in London."

* Need to: "You *need to* be quiet."

* Dare to: "I *dare to* disagree."

Ultimately, the categorization of a verb as auxiliary depends on its function within a sentence and how it interacts with the main verb.