Allow, Permit, or Let: How to Use Them Correctly in English

“My parents let me stay out late.”

“My parents allowed me to stay out late.”

“My parents permitted me to stay out late.”

These three sentences mean the same thing, but they are not identical. They differ in formality, grammatical structure, and the situations in which each one sounds natural.

Using “let” in a legal document may sound too casual. Using “permit” in a conversation with friends may sound stiff and awkward. Mixing up the grammar, such as saying “let me to go” instead of “let me go,” makes the sentence incorrect, even though the meaning is clear.

This guide explains exactly how these three verbs work, when to use each one, the grammar rules that make them different, the mistakes ESL learners make most often, and how to choose the right word every time.

What Do Allow, Permit, and Let Mean?

All three verbs share the same core meaning: to give someone permission to do something or to make it possible for someone or something to do something.

They are part of a group of verbs called causatives. Causative verbs describe how one person or thing causes something else to happen.

When you say, “She let me borrow the book,” the subject, “she,” did not borrow the book. She caused someone else, “me,” to borrow it by giving permission.

The differences between the three verbs involve four main areas:

Formality: How casual or official the word sounds.

Grammar structure: What comes after the verb.

Passive voice: Whether the verb can be used in passive constructions.

Context: Where each word is typically used, such as conversations, writing, signs, laws, and official documents.

Let’s look at each one.

What Is the Difference Between Let, Allow, and Permit?

Let: Informal, Direct, and Personal

“Let” is the most casual and natural of the three verbs. It is commonly used in everyday conversations, with friends and family, and in informal writing.

It usually implies a personal and direct act of giving permission. Someone actively chooses to allow something.

Grammar Structure

Let + object + base verb

The verb after the object does not use “to.”

Examples

She let me borrow her car.

My parents let me stay out until midnight.

The teacher let the students leave early.

Let me help you with that.

Don’t let the dog out!

Important Rule

“Let” does not use “to” before the following verb. This is one of the most common mistakes ESL learners make.

Correct: She let me go.

Incorrect: She let me to go.

Let in the Passive Voice

In standard English, “let” is not normally used in the passive voice.

You cannot say:

Incorrect: I was let to leave early.

Instead, use “allowed” or “permitted.”

Correct: I was allowed to leave early.

Correct: I was permitted to leave early.

Typical Contexts

“Let” is commonly used in:

Everyday conversations

Informal writing

Personal interactions

Friendly requests

Casual offers and suggestions

Allow: Neutral, Versatile, and Standard

“Allow” sits in the middle of the formality spectrum. It is more formal than “let” but less formal than “permit.”

You can use it in everyday situations and in official rules. It is the most versatile of the three verbs and is appropriate in almost any context.

Grammar Structure

Allow + object + to + verb

Unlike “let,” “allow” requires “to” before the following verb when an object is included.

Examples

My parents allowed me to stay out until midnight.

The company allows employees to work from home.

Smoking is not allowed in this building.

The new policy allows students to retake exams.

My teaching experience allows me to help English learners.

Important Rule

“Allow” uses “to” before the verb.

Compare:

Let: She let me leave.

Allow: She allowed me to leave.

Allow in the Passive Voice

“Allow” is commonly used in the passive voice, especially when talking about rules, policies, and regulations.

Active: They don’t allow visitors to take photographs.

Passive: Visitors are not allowed to take photographs.

Active: The school allows students to use laptops.

Passive: Students are allowed to use laptops.

Allow Followed by a Gerund

You can also use “allow” without an object and infinitive. In this structure, the next verb takes the gerund form.

Allow + gerund

The building does not allow smoking.

This restaurant allows tipping.

Compare the two structures:

They do not allow smoking.

They do not allow people to smoke.

Both sentences are correct. The second sentence includes a specific object, “people,” so it uses “to smoke.”

Allow Meaning “Make Possible”

In addition to expressing permission, “allow” can mean “to make something possible.”

In this meaning, the sentence is not necessarily about rules or authorization. It may describe circumstances or conditions that make an action possible.

The good weather allowed us to finish the project early.

Her experience allows her to handle difficult situations.

The scholarship allowed him to attend university.

Typical Contexts

“Allow” is commonly used in:

Rules

Signs

Policies

Guidelines

Everyday writing

Formal conversations

Instructions

Descriptions of what is or is not possible

Permit: Formal, Official, and Impersonal

“Permit” is the most formal of the three verbs. It is commonly used in official documents, legal language, regulations, public notices, and highly formal writing.

In everyday conversation, “permit” may sound stiff or overly official. In some casual situations, it can even sound humorous.

Grammar Structure

Permit + object + to + verb

“Permit” follows the same basic structure as “allow.”

Examples

The regulations do not permit employees to leave before 5 p.m.

Her illness does not permit her to work full time.

The city does not permit pets on the subway.

The court permitted him to visit his children on weekends.

He permitted himself a small smile.

Permit in the Passive Voice

Like “allow,” “permit” is commonly used in the passive voice. It appears frequently on public signs and in official notices.

Active: The museum does not permit photography.

Passive: Photography is not permitted in the museum.

Active: The law does not permit parking here.

Passive: Parking is not permitted here.

Permit Meaning “Make Possible”

Like “allow,” “permit” can also mean “to make possible,” particularly in formal contexts.

The weather did not permit us to proceed.

Time does not permit a full discussion.

The situation does not permit any mistakes.

Typical Contexts

“Permit” is commonly used in:

Public signs

Official notices

Legal documents

Formal rules and regulations

Academic writing

Professional writing

Side by Side Comparison

FeatureLetAllowPermitFormalityInformalNeutralFormalGrammarlet + object + base verballow + object + to + verbpermit + object + to + verbUses “to”?NoYesYesPassive voice?NoYesYesTypical contextConversations and personal situationsRules, signs, and everyday writingLaws, official notices, and formal documentsActive exampleShe let me leave.She allowed me to leave.She permitted me to leave.Passive exampleNot normally usedI was allowed to leave.I was permitted to leave.Sign or noticeNot normally usedSmoking is not allowed.Smoking is not permitted.

Two Meanings: Permission and Possibility

All three verbs can express two different ideas.

Meaning 1: Permission

In this meaning, someone gives authorization.

My boss let me leave early.

This expresses personal permission.

The school allows students to use calculators.

This expresses permission based on a rule.

Cameras are not permitted in the courtroom.

This expresses an official prohibition.

Meaning 2: Possibility

In this meaning, circumstances make something possible or impossible.

The clear sky let us see the stars.

The sky made it possible for us to see the stars.

The scholarship allowed her to study abroad.

The scholarship made studying abroad possible.

The weather did not permit us to fly.

The weather conditions made flying impossible.

In the possibility meaning, there is no person granting permission. The subject is usually a situation, condition, or object that makes something possible or impossible.

This second meaning is more common with “allow” and “permit” than with “let.”

“The rain didn’t let us play outside” is natural but informal.

“The rain didn’t allow us to play outside” sounds more neutral and standard.

“The rain didn’t permit us to play outside” sounds highly formal.

Common Mistakes and How to Fix Them

Mistake 1: Adding “To” After Let

Incorrect: My mother let me to go to the party.

Correct: My mother let me go to the party.

“Let” is always followed by the base form of the verb without “to.”

This is the most important rule to remember about “let.”

Mistake 2: Forgetting “To” After Allow and Permit

Incorrect: They don’t allow us leave early.

Correct: They don’t allow us to leave early.

Incorrect: The sign says they don’t permit people park here.

Correct: The sign says they don’t permit people to park here.

“Allow” and “permit” use “to” before the following verb when they are followed by an object and a verb.

Mistake 3: Using Let in the Passive Voice

Incorrect: I was let to use the computer.

Correct: I was allowed to use the computer.

Correct: I was permitted to use the computer.

“Let” cannot normally be used in passive constructions. When you need the passive voice, use “allow” or “permit.”

Mistake 4: Using Permit in Casual Conversation

The following sentence is grammatically correct but may sound unnatural in an informal conversation:

“Hey, will your mom permit you to come to the party tonight?”

A more natural version is:

“Hey, will your mom let you come to the party tonight?”

Using “permit” in casual speech can sound overly formal, similar to wearing a tuxedo to the grocery store.

Use “let” in everyday conversation and “permit” in official contexts.

Mistake 5: Confusing the Gerund Structure

Incorrect: They don’t allow to smoke in the building.

Correct: They don’t allow smoking in the building.

This structure uses “allow” followed by a gerund because no specific person is mentioned.

You can also say:

Correct: They don’t allow people to smoke in the building.

This structure includes a specific object, “people,” so it uses:

Allow + object + to + verb

When there is no specific object, use:

Allow + gerund

When there is a specific object, use:

Allow + object + to + verb

Idiomatic Expressions and Fixed Phrases

Each of these verbs appears in common English expressions.

Expressions With Let

Let Me Know

Meaning: Tell me or inform me.

“Let me know if you need help.”

Let It Go

Meaning: Stop worrying about it or stop holding on to it.

“It happened. Just let it go.”

Let Alone

Meaning: Used to emphasize that something is even less likely or possible.

“He can’t run a mile, let alone a marathon.”

Let Down

Meaning: Disappoint someone.

“I’m sorry I let you down.”

Let’s

“Let’s” is the contracted form of “let us” and is used to make a suggestion.

“Let’s go to the park.”

Expressions With Allow

Allow For

Meaning: Take something into account or leave extra time, space, or resources for it.

“Allow for 30 minutes of travel time.”

Allow Me

Meaning: A formal or polite way to offer help or introduce an action.

“Allow me to open the door for you.”

Not Allowed

Meaning: Prohibited.

“You’re not allowed to park here.”

Expressions With Permit

Weather Permitting

Meaning: If the weather is suitable.

“The picnic is Saturday, weather permitting.”

Permit Me To

Meaning: A very formal way to introduce an explanation or action.

“Permit me to explain.”

Building Permit or Parking Permit

In these expressions, “permit” is a noun. It refers to an official document that gives authorization.

“You need a permit to build here.”

Pronunciation Note

“Permit” has different stress depending on whether it is a noun or a verb.

As a noun, PERmit, the stress is on the first syllable.

As a verb, perMIT, the stress is on the second syllable.

The spelling is the same, but the stress and word class are different.

Practice Exercises

Choose the correct word, “let,” “allow,” or “permit,” and use the correct form.

Exercise 1: Fill in the Blank

1. My parents ______ me stay out until 11 p.m.
   Casual context.
2. Visitors are not ______ to touch the artwork.
   Museum sign.
3. The teacher ______ the students to use dictionaries during the test.
4. Photography is not ______ inside the building.
   Official notice.
5. She didn’t ______ me explain my side of the story.
   Casual context.
6. The new software ______ users to export files in multiple formats.
7. Passengers are not ______ to carry liquids over 100 ml.
   Airport rule.
8. His experience ______ him to solve problems quickly.
9. ______ me help you with your bags.
   Casual offer.
10. The regulations do not ______ employees to work remotely.
    Formal policy.

Answers to Exercise 1

Let

Casual context. “Let” is followed by the base verb without “to.”

“My parents let me stay out until 11 p.m.”

Allowed or permitted

Both can be used in passive constructions. “Permitted” sounds slightly more formal.

“Visitors are not allowed to touch the artwork.”

“Visitors are not permitted to touch the artwork.”

Allowed

This is a neutral school context. “Allowed” is followed by an object and “to.”

“The teacher allowed the students to use dictionaries during the test.”

Permitted

This is an official notice, so the most formal option is appropriate.

“Photography is not permitted inside the building.”

Let

This is a casual context, and “let” is followed by the base verb.

“She didn’t let me explain my side of the story.”

Allows

This describes a function or capability.

“The new software allows users to export files in multiple formats.”

Permitted

This is an official airport rule in the passive voice.

“Passengers are not permitted to carry liquids over 100 ml.”

Allows

This describes possibility or capability.

“His experience allows him to solve problems quickly.”

Let

This is a casual offer.

“Let me help you with your bags.”

Permit

This is a formal policy.

“The regulations do not permit employees to work remotely.”

Exercise 2: Correct the Mistakes

1. She let me to borrow her laptop.
2. Smoking is not let in the hospital.
3. They don’t permit us leave before 5 p.m.
4. The security guard didn’t allowed us to enter.
5. My boss permits me go home early on Fridays.
   Casual conversation.

Corrected Sentences

1

Correct: She let me borrow her laptop.

Remove “to” because “let” never uses “to” before the following verb.

2

Correct: Smoking is not allowed in the hospital.

Also correct: Smoking is not permitted in the hospital.

“Let” cannot be used in this passive construction.

3

Correct: They don’t permit us to leave before 5 p.m.

Add “to” after the object, “us.”

4

Correct: The security guard didn’t allow us to enter.

Use the base form “allow” after “didn’t.”

5

Correct: My boss lets me go home early on Fridays.

“Permit” is too formal for this casual conversation. “Let” sounds more natural and does not use “to.”

Quick Decision Guide: Which Word Should You Use?

Are You Speaking or Writing Casually?

Use let.

“My friend let me crash at his place.”

Are You Stating a Rule, Writing a Sign, or Describing What Is Possible?

Use allow.

“Guests are not allowed to bring outside food.”

Are You Writing Something Official, Legal, or Highly Formal?

Use permit.

“Visitors are not permitted beyond this point.”

Are You Using the Passive Voice?

Use allow or permit. Do not use “let.”

Correct: We were allowed to leave early.

Correct: We were permitted to leave early.

Incorrect: We were let to leave early.

Are You Still Unsure?

Use allow.

It works in almost every context. It is casual enough for many conversations and formal enough for most kinds of writing.

References

1. Cambridge Dictionary. “Allow, Permit or Let?”
   https://dictionary.cambridge.org/grammar/british-grammar/allow-permit-or-let
2. Collins Dictionary. “What Is the Difference Between Allow, Permit, Let and Enable?”
   https://grammar.collinsdictionary.com/english-usage/what-is-the-difference-between-allow-permit-let-and-enable
3. VOA Learning English. “The Verbs Let, Allow and Permit.”
   https://learningenglish.voanews.com/a/let-me-tell-you-about-let-allow-and-permit/4666675.html
4. LanGeek. “Let vs. Allow vs. Permit.”
   https://langeek.co/en/grammar/course/1698/let-vs-allow-vs-permit
5. My Lingua Academy. “Let, Allow and Permit.”
   https://myenglishteacher.co.uk/2024/04/24/let-allow-and-permit/
6. English Mines. “Mastering the Vocabulary: Allow, Enable, Permit, and Let.”
   https://www.englishmines.com/post/understanding-the-use-of-allow-enable-permit-and-let-in-english

This guide was published by Lingua Language Center, which has been teaching English and foreign languages in South Florida since 1998.

For more free English resources, visit lingua.edu/blog.