“X是X”是日常交际中常见的一种构式,本文试图从信息论角度来考察。“X是X”可以表示预期信息标记以及反预期信息标记。预期信息标记分为预期信息标记、负信息预期标记以及超预期信息标记。本文将针对以上几种情况对该构式进行描述与分析。 “X is X ” is a kind of common structure in daily communication. This paper attempts to examine from the perspective of information theory. “X is X ” can represent the expected information tag and the anti-expected information tag. The expected information tag is divided into expected information tag, negative information expected tag, and unexpected information tag. This paper will describe and analyze the above structure for the above situations.