Prohibition (sự cấm đoán): mustn't, can't, Strong obligation (bắt buộc mạnh): must, have (got) to, Necessity (sự cần thiết): need to, Weak obligation/Advice (bắt buộc yếu/lời khuyên): should, ought to, Suggestion (sự gợi ý): should/ shall, Possibility (sự có thể): can, could, may, might,

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