How it works:
* Helping verbs (also called auxiliary verbs) help the main verb in a sentence. They provide information about tense, mood, and voice.
* Common helping verbs: be (am, is, are, was, were, been, being), have (has, have, had, having), do (does, did, doing), will, would, can, could, may, might, shall, should, must.
Examples:
* She has been working on the project all week. (Helping verbs: has, been)
* They should have been notified by now. (Helping verbs: should, have, been)
* We could have gone to the concert, but we decided to stay home. (Helping verbs: could, have)
Important Note:
* Two helping verbs typically occur when you combine different verb tenses or moods. For example, "should have been" combines the modal verb "should" with the perfect tense "have been".
Let me know if you'd like more examples or have any other questions!