Have to / Has to in English

Overview

Have to and has to are used to express external obligation -- things you must do because of rules, laws, situations, or other people's expectations. This is different from must, which often expresses personal or internal obligation. Understanding this distinction is essential for communicating about duties and responsibilities in everyday English.

This concept is part of the CEFR A2 level, meaning it is one of the early structures you will learn as you move beyond beginner English. If you already know how to use should and must, then have to is a natural next step. It is extremely common in both spoken and written English, and mastering it will make your speech sound much more natural.

One of the key advantages of have to over must is that it works in all tenses. While must has no past tense form, have to can be used in the past (had to), present (have to / has to), and future (will have to). This flexibility makes it an indispensable part of your grammar toolkit.

How It Works

Present Tense Forms

Subject	Affirmative	Negative	Question
I / You / We / They	have to go	don't have to go	Do you have to go?
He / She / It	has to go	doesn't have to go	Does she have to go?

Past Tense

Form	Example
Affirmative	I had to wait for an hour.
Negative	She didn't have to pay.
Question	Did you have to work yesterday?

Future Tense

Form	Example
Affirmative	We will have to leave early.
Negative	You won't have to worry.
Question	Will I have to bring anything?

Key Rules

1. Third person singular uses has to in the present (he has to, she has to, it has to).
2. Questions and negatives use do/does/did -- just like other main verbs: "Do you have to...?" not "Have you to...?"
3. Don't have to means something is not necessary -- it does NOT mean "must not." This is a crucial difference. "You don't have to come" means it is optional. "You mustn't come" means it is forbidden.

Examples in Context

English	Note
I have to work tomorrow.	External obligation (my schedule requires it)
She has to leave early.	Third person singular: has to
Do you have to wear a uniform?	Question form with do
I didn't have to pay.	Past negative: it was not necessary
We have to be quiet in the library.	Rule-based obligation
He has to take the exam again.	External requirement
You don't have to answer that question.	No obligation -- it is optional
I had to walk because the bus didn't come.	Past obligation due to circumstances
Will we have to wait long?	Future question
She doesn't have to cook tonight.	Not necessary (someone else is cooking)

Common Mistakes

Confusing "don't have to" with "mustn't"

• Wrong: You don't have to park here. (meaning it is forbidden)
• Right: You mustn't park here. (forbidden) / You don't have to park here. (not necessary)
• Why: "Don't have to" means there is no obligation. "Mustn't" means it is prohibited. These have opposite meanings.

Forgetting "has to" for third person

• Wrong: She have to go now.
• Right: She has to go now.
• Why: Like other present tense verbs, the third person singular requires a different form.

Using "have to" without "do" in questions

• Wrong: Have you to finish this today?
• Right: Do you have to finish this today?
• Why: In modern English, have to forms questions and negatives with do/does/did, not by inverting have.

Using "must" in the past tense

• Wrong: Yesterday I must work late.
• Right: Yesterday I had to work late.
• Why: Must has no past tense form. Use had to for past obligations.

Usage Notes

In everyday conversation, have to is far more common than must for expressing obligation. Must can sound formal, authoritative, or even bossy in casual speech. Compare: "You must be here at 9" (sounds like a strict order) vs. "You have to be here at 9" (sounds more neutral).

In informal spoken English, have to is often pronounced "hafta" and has to sounds like "hasta." You will hear this constantly in natural speech.

In American English, have to is strongly preferred over must in most situations. British English uses must slightly more often, but have to is still the dominant choice in casual contexts.

Got to (have got to / 've got to) is another informal alternative: "I've got to go" means the same as "I have to go." In very casual speech, this becomes "gotta" -- but avoid this in writing.

Practice Tips

• Compare pairs: Write sentences using both must and have to for the same situation. Notice how the feeling changes. Then write sentences where only one is correct (e.g., past tense requires had to).
• Daily obligations: Each morning, list five things you have to do that day. Practice both affirmative and negative: "I have to go to work. I don't have to cook dinner."
• Listen for it: Pay attention to TV shows, podcasts, or songs in English. Count how many times you hear "have to" vs. "must." You will quickly notice that have to dominates in natural speech.

Related Concepts

• Prerequisite: Should and Must -- understanding basic modal verbs for obligation and advice provides the foundation for learning have to