Modal Verbs
"Must" and "have to" both express obligation, but with a nuance: "must" usually means the obligation comes from the speaker or is internal ("I must call her — I promised"), while "have to" usually means an external rule or necessity ("I have to wear a suit for work"). "Mustn't" means it is forbidden, while "don't have to" means it is not necessary — a very important distinction!
"Must" and "have to" both express obligation, but with a nuance: "must" usually means the obligation comes from the speaker or is internal ("I must call her — I promised"), while "have to" usually means an external rule or necessity ("I have to wear a suit for work"). "Mustn't" means it is forbidden, while "don't have to" means it is not necessary — a very important distinction!
Practice
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Put the words in the correct order: