The king should be like king. None of those is possible, even in poetry. They just sound like foreigner's mistakes.
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BiorophantKing should be like king.A king should be like king.King should be like a king.Using definite article(s) seems possible as well.The king should be like king.None of those is possible, even in poetry. They just sound like foreigner's mistakes. (I think you mean "act", too, but "be" is OK if you really want.) "A king should act like a king" is right.