Must, Mustn‘t, Needn‘t Usage
Must. mustn‘t needn‘t. Must is use when something is necessary. You must wash your teeth after every meal. Must remember to write a letter. Must do my homework. Mustn‘t is use to say something is a bad idea. Mustn‘t. He mustn‘t forget his key, or he won‘t get in. Tim and Alex mustn't open the window. Needn‘t is use when something is not necessary. You needn‘t go to school on Sunday. Ann needn‘t wash those glasses, they‘re clean. "You needn't worry," said Dorothy.
You must wash your teeth after every meal.
Mustn‘t is use to say something is a bad idea.
You mustn‘t smoke a lot. It‘s bad for your health.
He mustn‘t forget his key, or he won‘t get in.
Ann needn‘t wash those glasses, they‘re clean.
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- Gymnasium
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