Advice / Opinion: You shouldn't go outside today, it is cold and raining., My grandmother just had surgery, I ought to call her., You should wear sun cream at the beach to avoid a sunburn., Obligation / Requirement: You mustn't wear a hat in the classroom., We have to complete the project by Friday., He must finish his homework before he can play videogames., You need to wear appropriate clothes for PE., You don't have to come to the store with me.,
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