Auxiliary Verbs in English: How to Use Do, Be and Have ⚙️

Auxiliary verbs are the helping verbs that work alongside main verbs to build tenses, questions and negatives. In English, the three main auxiliaries are do, be and have. Understanding exactly what each one does will make your whole grammar clearer. 🎯

1. DO: questions and negatives in present and past simple 📋

Do / does / did are used to build questions and negatives when there is no other auxiliary:

Use	Example
Present simple question	Do you speak Italian? / Does she work here? ✅
Present simple negative	I do not like fish. / She does not live here. ✅
Past simple question	Did they arrive on time? ✅
Past simple negative	He did not call me. ✅
Emphasis (stress)	I do understand you! (emphatic) ✅

Important: do/does/did is NOT used with the verbs be or have (when have is an auxiliary):

• Are you tired? ✅ (not: Do you be tired?)
• Have you finished? ✅ (not: Do you have finished?)

2. BE: continuous tenses and the passive 📋

Am / is / are / was / were are used to build continuous tenses and passive forms:

Use	Example
Present continuous	She is working from home today. ✅
Past continuous	They were watching a film when I called. ✅
Present passive	English is spoken all over the world. ✅
Past passive	The building was built in 1890. ✅

3. HAVE: perfect tenses 📋

Have / has / had are used to build perfect tenses. Always followed by the past participle:

Use	Example
Present perfect	I have visited Paris twice. ✅
Present perfect negative	She has not finished yet. ✅
Present perfect question	Have you ever eaten sushi? ✅

4. Common mistakes ⚠️

✅ Correct	❌ Wrong
Does she work here?	Is she work here?
She is working now.	She does working now.
Have you seen it?	Do you have seen it?
He did not go.	He did not went.

Master these three auxiliaries and you control English grammar! 🚀