1. When I was a child I could run all day. - Making a polite request, Could I borrow your rubber? - Expressing prohibition, There’s no bread at home. I must buy some. - Asking permission politely, I have a Maths test tomorrow. I must study. - Expressing necessity, I would like some lemonade, please - Expressing ability in the past, We mustn’t use a mobile phone in class. - Expressing an obligation that I decide, We have to wear uniforms in our school. - Expressing an obligation that someone else decides,

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