Auxiliary verbs are used in conjunction with main verbs to provide additional information about the action or state being described. Here are some examples of how to use auxiliary verbs in sentences:

1. To form the present or past progressive tense:

   • She is singing. (using “is” as the auxiliary verb)
   • They had been waiting for hours. (using “had been” as the auxiliary verbs)

2. To form the perfect tenses:

   • I have finished my work. (using “have” as the auxiliary verb)
   • They will have arrived by the time we get there. (using “will have” as the auxiliary verbs)

3. To form questions and negatives:

   • Does she like chocolate? (using “does” as the auxiliary verb)
   • I do not enjoy public speaking. (using “do” as the auxiliary verb)

4. To add emphasis:

   • I did finish my homework last night. (using “did” as the emphatic auxiliary verb)
   • You should not have forgotten your keys. (using “should have” as the auxiliary verbs)

5. To express ability, obligation, or possibility:

   • She can speak three languages fluently. (using “can” as the auxiliary verb)
   • We must leave immediately. (using “must” as the auxiliary verb)
   • They may arrive late due to the weather. (using “may” as the auxiliary verb)

The auxiliary verb provides grammatical information, while the main verb expresses the core meaning of the action or state. Using auxiliary verbs correctly is essential for forming complex verb phrases in many languages.