Must vs. have to
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Must vs. have toBoth Must and have to express obligation or necessity, but there are some small differences:
• Must expresses the speaker's feelings, whereas have to expresses, above all, an impersonal idea:
You have to come. You are obliged to come. (There's a rule requiring you to come)
Do I have to wear this tie? Am I obliged to wear this tie? (Is there a rule about ties?)
• Have to mainly expresses general obligations, while must is used for specific obligations:
Important: To express obligation, duty or necessity in the future or the past, must and need are not used. They are replaced by have to:
We had to buy another ticket yesterday.
We'll have to buy another ticket later.
However, in their negative forms, mustn't and don't have to have completely different meanings:
• Mustn't expresses prohibition
• Don't have to expresses the absence of obligation or necessity:
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