B1+ UPPER AUXILIARY AND MODAL VERBS
Explicación
Tower Languages
Online Learning is Today
Created by Julio Ángel R. — Bilingual Educator
Grammar · B1 English
⭐ Auxiliaries & Modal Verbs
Helping verbs that build tenses · Modals that express meaning · Structure · Real-life use
📌 What are auxiliaries?
1️⃣ BE
2️⃣ HAVE
3️⃣ DO
⭐ Modal verbs
📊 Tables
🧠 Key differences
What Are Auxiliary Verbs?
Auxiliary verbs (also called helping verbs) support the main verb. They do not usually carry the main meaning — instead they help the main verb express tense, voice, questions, and negatives.
The Three Main Auxiliary Verbs
BE
🔵 Continuous & Passive
am · is · are · was · were · been
"She is working." · "It was completed."
HAVE
🟡 Perfect Tenses
have · has · had
"I have finished." · "They had left."
DO
🟢 Questions & Negatives
do · does · did
"Do you agree?" · "I do not understand."
BE as an Auxiliary
BE
am · is · are · was · were
✔ Continuous tenses — structure:
Subject+BE+verb -ing
I am studying English.
She is working late.
They were playing soccer.
✔ Passive voice — structure:
Subject+BE+past participle
The project was completed yesterday.
The lesson is explained clearly.
⚠️ BE can also be a Main Verb
Auxiliary (helping)
"She is working." → is + -ing
Main Verb
"She is tired." → is = state
HAVE as an Auxiliary
HAVE
have · has · had
✔ Present Perfect:
Subject+have / has+past participle
I have finished my homework.
She has traveled abroad.
✔ Past Perfect:
Subject+had+past participle
They had left before we arrived.
⚠️ HAVE can also be a Main Verb
Auxiliary (helping)
"I have finished the task."
Main Verb
"I have a car." → possession
DO as an Auxiliary
DO
do · does · did
✔ Questions:
Do / Does+Subject+base verb?
Do you work here?
Does she like coffee?
✔ Negatives:
Subject+do not+base verb
I do not understand.
He does not drive.
✔ Emphasis:
I do like this movie!
She does work hard.
⚠️ DO can also be a Main Verb
Auxiliary (helping)
"Do you like tea?" → question
Main Verb
"I do my homework." → action
Summary Table — Auxiliary Verbs
| Auxiliary | Used for | Example |
|---|---|---|
| BE | Continuous / Passive | She is working |
| HAVE | Perfect tenses | I have finished |
| DO | Questions / Negatives / Emphasis | Do you agree? |
Modal Verbs — A Special Type of Auxiliary
Modal verbs are a special type of auxiliary verb. Unlike BE/HAVE/DO which build tenses, modals express meaning — telling us how sure, allowed, able, or obligated the speaker feels about the action.
Common Modal Verbs
| Modal | Main Use |
|---|---|
| can | Ability / Permission |
| could | Past ability / Polite request |
| may | Permission / Possibility |
| might | Possibility (uncertain) |
| must | Strong obligation / Probability |
| have to | Strong obligation (external) |
| should | Advice / Recommendation |
| will | Future intention / Promise |
| would | Hypothetical / Polite request |
Modal Verb Structure
Modal verbs are always followed by the base verb — never "to".
Subject+Modal+Base Verb
I can swim. · She must study. · We should leave now.
Common Mistake — Never Use "to" After a Modal
❌ Wrong
"She can to drive."
✅ Correct
"She can drive."
⚠️ Golden Rule: Modal + base verb — NEVER Modal + to + verb.
Modals in Questions & Negatives
❓ Questions
Modal+Subject+base verb?
Can you help me?
Should we start?
🚫 Negatives
Subject+modal+not+base verb
You should not worry.
They cannot come.
Real-Life Examples
🟢 AbilityI can speak English.
🔵 PermissionMay I enter?
🟡 AdviceYou should sleep more.
🔴 ObligationEmployees must wear uniforms.
🟣 PossibilityIt might rain today.
🔵 FutureWe will finish the project.
🟣 HypotheticalI would travel more if I had time.
Semi-Modal: HAVE TO
Have to works like a modal (strong obligation) but behaves like a normal verb — it changes with tense and uses "do" for questions.
✔ Changes with tense
I have to work tomorrow.
She had to leave early.
She had to leave early.
✔ Uses "do" for questions
Do you have to wake up early?
Does she have to attend?
Does she have to attend?
Key Differences — Auxiliary vs Modal
🔵 Auxiliary Verb
Function: Grammar support
Helps build tenses, questions, negatives, passive. Does not add meaning.
"She is working." · "I have finished." · "Do you agree?"
🟡 Modal Verb
Function: Express meaning
Adds meaning: ability, obligation, permission, advice, possibility, future.
"She can work." · "I must finish." · "You should study."
| Type | Function | Example |
|---|---|---|
| Auxiliary | Grammar support | She is working |
| Modal | Meaning (ability, obligation, etc.) | She can work |
Teaching Tip — How to Tell Them Apart
👉
Is this verb helping the tense? (continuous, perfect, passive)
→ Auxiliary
👉
Is this verb showing ability, obligation, permission, or possibility?
→ Modal
Quick Comparison
AUXShe is working.
MODShe can work.
AUXI have finished.
MODI must finish.
AUXDo you work here?
MODCan you help me?
Final Insight
Auxiliaries help structure sentences. Modals help express meaning. Together, they are essential tools for clear and natural English communication.
SpeakingBuild tenses and express ideas clearly in conversation.
WritingCreate accurate sentences with the right tense and meaning.
Professional CommunicationUse modals for polite, formal, and precise workplace language.
Real-Life SituationsAsk permission, give advice, express obligation, and talk about the future.
Ejercicio 1
Tower Languages
Online Learning is Today
Created by Julio Ángel R. — Bilingual Educator
Exercise 1 — Choose the Correct Auxiliary Verb
— / 10
Instrucción: Read each sentence carefully and choose the correct auxiliary verb — is / are / was, do / does / did, or have / has. The context of each sentence is your key clue!
be (is / are / am)
🔵 Continuous / Passive
Used for actions in progress right now, or passive sentences.
"She is working." · "It is scheduled."
do / does / did
🟢 Questions / Negatives
Used in questions and negatives with simple tenses.
"Do you like coffee?" · "We do not understand."
have / has / had
🟡 Perfect tenses
Used with past participle to form perfect tenses.
"They have finished." · "I have completed it."
was / were
🟣 Past be
Past tense of "be" — for past states or past passive.
"The project was finished." · "She was late."
Check Answers ✓
Ejercicio 2
Tower Languages
Online Learning is Today
Created by Julio Ángel R. — Bilingual Educator
Modal Verbs — Choose the Correct Modal
— / 10
Instrucción: Choose the modal verb that best completes each sentence. Read the function label on each card — it tells you what job the modal needs to do (obligation, ability, permission, advice, possibility, or future intention).
Obligation
🔴 must / have to
must · have to
Strong obligation — a rule or requirement.
"You must wear a helmet."
Ability
🟢 can / could
can · could
Skill or capacity to do something.
"I can speak English."
Permission
🔵 may / can
may · can · could
Asking for or giving permission.
"May I open the window?"
Advice / Necessity
🟡 should / need to
should · ought to · need to
Recommendation or what is needed.
"You should study more."
Possibility / Probability
🟣 might / must
might · may · could · must
Uncertain event or logical conclusion.
"It might rain." · "She must be tired."
Future Intention
🔵 will / going to
will · shall · going to
A decision, promise, or planned action.
"I will help you tomorrow."
Check Answers ✓