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Have to VS Must, Don't have to VS Mustn't

HAVE TO


"Have to" is used when something is necessary or required, but the requirement comes from an external source (Another Person), like a rule, obligation, or someone else's authority. It implies that there is an external reason or obligation forcing you to do something.

Example: "I have to finish my homework because my teacher assigned it."

MUST

"Must" is also used to express necessity or a requirement, but it often comes from your own personal choice, responsibility, or inner conviction. It implies a strong sense of personal obligation or determination.

Example: "I must study hard if I want to get a good grade."

In summary, "have to" suggests an external obligation, while "must" indicates a personal commitment or strong feeling of necessity.

Negative forms "Don't Have to"


Don't have to: This is used when you want to emphasize that there is no obligation or requirement (Something is not necessary) Example: "You don't have to come to the party if you're busy."


Doesn't have to: This is used with the third person singular (he, she, it) to indicate that someone or something is not required to do something. Example: "She doesn't have to submit her report until next week."


"Mustn't"


Mustn't: This is used to indicate that it is important not to do something or something is forbidden. Example: "You mustn't forget to lock the door when you leave."

Must not: This is the full form of the negative and is used in more formal contexts. Example: "Employees must not disclose confidential information to unauthorized individuals."


In summary, the negative forms of "have to" and "must" allow you to express that something is not necessary or not allowed, depending on the context of obligation or necessity.


 

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