在古典诗词中，平仄是构成诗歌韵律的基础。平仄规律是古代汉语诗歌格律的重要组成部分，它涉及到诗句的声调搭配，对于诗歌的音韵美有着至关重要的作用。《咏怀古迹其三》是唐代诗人杜甫的作品，以下将以此诗为例，详细解析平仄规律中的谓粘和对的要领。
一、平仄基本概念
在古代汉语中，声调分为平声、上声、去声和入声。平声指的是声调平直，上声指的是声调先升后降，去声指的是声调先降后升，入声则是声调短促。在诗词创作中，平声和上声、去声、入声的搭配形成了平仄的规律。
二、《咏怀古迹其三》平仄分析
《咏怀古迹其三》原文如下：
三更灯火五更鸡，正是男儿读书时。
黑发不知勤学早，白首方悔读书迟。
首先，我们将诗句中的每个字按照平仄进行标注：
三更灯火五更鸡，正是男儿读书时。
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