it’s necessary: You have to be at work on time., She must take care of her kids., it’s not necessary: You don’t have to apologize, it’s okay., He doesn’t have to drive, I can do it., it’s a good / bad idea: You shouldn’t give your kid too much sugar., I should probably talk to him., it’s forbidden or dangerous: You mustn’t drink and drive!, You can’t be here, it’s illegal., lack of ability: I can’t speak Japanese yet., ability / possibility / it's allowed: I can send you the details if you are interested.,

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