English Auxiliaries: to be, to have, to do

Introduction

Auxiliary verbs are used with other verbs to form tenses, negatives, questions, or passive voice. In English, the three main auxiliaries are:

to be: used for identity, state, passive voice, and continuous tenses
to have: used for perfect tenses
to do: used for negatives, questions, and emphasis

1. The auxiliary to be

Used to express state, build continuous tenses, or passive voice.

Subject	Present	Past
I	am	was
You	are	were
He/She/It	is	was
We/You/They	are	were

I am tired. – I feel a need to rest because I have done a lot or I am sleepy.
She is working. – She is doing a task or job right now.
The cake was eaten. – Someone has already eaten the cake.

2. The auxiliary to have

Used for perfect tenses and to express possession.

Subject	Present	Past
I/You/We/They	have	had
He/She/It	has	had

I have eaten. – I already ate food.
She has gone. – She is no longer here; she left.
They had finished. – They completed something before a certain time.
I have a car. – I own or possess a vehicle with four wheels.

🇬🇧 I have got a bike. – I own or possess a bicycle. (UK)

🇺🇸 I have a bike. – I own or possess a bicycle. (US)

3. The auxiliary to do

Used to form negatives, questions, and emphasis.

Subject	Present	Past
I/You/We/They	do	did
He/She/It	does	did

Do you like music? – Do you enjoy listening to songs or sounds made by instruments?
He doesn’t understand. – He cannot grasp or know the meaning of something.
I do want to learn! – I really wish to gain knowledge or skills!

4. Summary table

Function	to be	to have	to do
Main verb	✅	✅	❌
Progressive tenses	✅	❌	❌
Perfect tenses	❌	✅	❌
Passive voice	✅	❌	❌
Questions/Negations	yes (with be)	yes (with have)	✅
Emphasis	❌	❌	✅

5. Quick quiz

___ you like coffee? → Do – Do you enjoy drinking coffee?
She ___ gone home. → has – She went back to her house.
They ___ playing football. → are – They are currently taking part in a football game.

6. Common mistakes

❌ She do her homework. → ✅ She does her homework. – She completes her school assignments.
❌ He have a car. → ✅ He has a car. – He owns a vehicle with four wheels.
❌ Is she plays piano? → ✅ Does she play piano? – Do you want to know if she can perform music on the piano?

7. Conclusion

Mastering English auxiliaries is essential to form correct sentences and understand all grammatical structures. Knowing how to use to be, to have and to do helps you:

Build accurate statements, questions and negations
Use continuous and perfect tenses
Form passive voice constructions

👉 Keep practicing and observing how auxiliaries appear in real English texts and conversations!