Must vs Should vs You have to

When to use each in English, with meaning, register, and examples.

Must

High-frequency chunk A1

Should

Top 1,000 (very common) A1

You have to

Top 2,000 (common)

	Must	Should	You have to
Pronunciation	🇬🇧 /["/məst//mʌst/","/ˈmʌsnt/"]/ 🇺🇸 /["/məst//mʌst/","/ˈmʌsnt/"]/	🇬🇧 /["/ʃəd//ʃʊd/","/ˈʃʊdnt/"]/ 🇺🇸 /["/ʃəd//ʃʊd/","/ˈʃʊdnt/"]/	🇬🇧 //jʊ hæv tə// 🇺🇸 //ju hæv tu//
Meaning	Something that is necessary or very important.	used to tell someone what is the right thing to do	You must do something.
Example	You must finish your homework before playing outside.	You should study for the exam to do well.	You have to submit your application by Friday.
Register	Neutral	Neutral	Neutral
How common	High-frequency chunk	Top 1,000 (very common)	Top 2,000 (common)
CEFR level	A1	A1	-
Collocations	must see, must do, must have, must remember	should do, should have, should not, should consider, should remember	have to go, have to wait, have to see, have to choose, have to find
Antonyms	can, may, might	must not, shall not	-
Common mistakes	Using 'must' in situations where 'have to' is more suitable., Confusing 'must' with 'might' or 'may', which imply possibility instead of necessity., Using 'must' with the gerund form instead of the base form of the verb.	'Should' is often confused with 'must,' leading to weaker advice than intended., Forget to follow 'should' with the base form of the verb, e.g., saying 'should goes' instead of 'should go.', Using 'should' for past events instead of 'should have.'	Using 'have to' with 'will' incorrectly (e.g., 'You will have to do this')., Confusing 'have to' with 'can' (suggesting ability instead of obligation)., Omitting 'to' after 'have' (e.g., saying 'You have go').
Usage notes	Use 'must' when giving strong advice or making strong recommendations. Avoid using it in casual conversations where 'should' might be more appropriate.	Use 'should' for advice, suggestions, or expectations. It's appropriate in both spoken and written English, but avoid it in very formal contexts where 'ought to' might be preferred.	Common in both spoken and written English. Use 'have to' for obligations and necessities. It's more informal than 'must' but more versatile.

See it in real clips

I must have drank me about 15 Dr Peppers.

A Knight Of The Seven Kingdoms › S1 E1

Must you mock me?

Game Of Thrones › S1 E1

You must be Robb.

I must have drank me about 15 Dr Peppers.

A Knight Of The Seven Kingdoms › S1 E1

Must you mock me?

Must

Top Gun › Top Gun Maverick

Working as a team, you have to shoot me down, or else.

- Do you always look at it encoded? - Well, you have to.

Avengers › Avengers Endgame

To get in there, you have to be incredibly small.

Top Gun › Top Gun Maverick

Working as a team, you have to shoot me down, or else.

- Do you always look at it encoded? - Well, you have to.

You have to

Frequently asked questions: Must vs Should vs You have to

What's the difference between Must, Should, and You have to?

Must: Something that is necessary or very important. Should: used to tell someone what is the right thing to do You have to: You must do something.

Can you show an example of each?

Must: You must finish your homework before playing outside. Should: You should study for the exam to do well. You have to: You have to submit your application by Friday.

Can I use Must, Should, and You have to interchangeably?

Not always. Must, Should, and You have to are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.