Auxiliaries or Auxiliary Verbs are the verbs that merely help principal verbs in the formation of various verb forms. They are important as structural verbs.
Auxiliaries are of two types: Primary Auxiliaries and Modal Auxiliaries

Primary Auxiliaries List | Be Verb: is, am, are, was, were, been, being Have Verb: have, has, had, having Do Verb: do, does, did |
The Use of Primary Auxiliaries
Primary Auxiliaries are, Do verbs, Have verbs, and Be verbs.
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Be Verbs (am, is, are, was, were)
- I am working,
- You are writing.
- He is sleeping.
- I am going to the store.
- He is studying for his exam.
- They are playing soccer in the park.
- We are watching a movie tonight.
- The cat is sleeping on the couch.
- You are reading a book right now.
- My friends are coming over for dinner.
Have Verbs (Have, Has, Had)
- I have a meeting at 2 PM.
- She has already finished her homework.
- They have been studying for hours.
- He has not been feeling well lately.
- We have decided to go on vacation this summer.
- You have to submit the report by the end of the week.
- My sister has a lot of experience in marketing.
- She had forgotten her keys and was locked out of her apartment.
- They had never been to Europe before their trip last summer.
- He had finished his work before the deadline.
Do Verbs (Do, did, does)
- He does not like spicy food.
- We did a lot of sightseeing on our trip to Europe.
- Do not waste your time.
- You do not look well.
- Do you not like sweets?
- Did she not pass the test?
- The children have done their homework.
- Did he come to school yesterday?
- My boss did not approve my vacation request.
- The team has done an excellent job this season.
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Also, Read

Joining Sentences

Conjunctions

Figures of Speech

Preposition
