Since either the word "must" and "should" refer to necessity, can I say "mustn't" instead of "shouldn't" in this context?

Native speaker’s answer

Rebecca

I see where you're coming from! However, they do have slightly different meanings. "Must" is a stronger word than "should" and expresses something you are required to do, whereas "should" is used more as advice or a recommendation in this context, especially when used in a question. Ex: You mustn't be so rude to him. He won't come back if you do that. Ex: Shouldn't you put salt in the food before serving it? Ex: You must be home by eight tonight!

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03/24

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