Please double-click on the English subtitles below to play the video.
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Hi guys! This is Kee from BBC Learning English.
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Today, I'm going to tell you the differences
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between mustn't and don't have to.
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Now, must and have to are similar in meaning.
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They are both used to describe obligations.
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However, their negative forms
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are completely different in meaning.
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We still use mustn't to talk about obligations.
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For example:
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In the house, I mustn't wear shoes.
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You know, to keep the house clean.
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But don't have to does not describe obligations,
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so the choice is yours!
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For example, if your teacher said:
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you don't have to do your homework,
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well... then choice is yours.
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You can say:
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Alright, I won't!
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