The plagal cadence, sometimes known as the Amen cadence from ecclesiastical use, is the progression from the chord of the subdominant to the tonic, IV - I.

变格终止，有时也被称为源于“阿们终止”，是指从属音到主音进行，IV–I。

The word is generally used to indicate the harmonization of the two final notes, classified as authentic or perfect, plagal, half or imperfect, and deceptive or interrupted.

这个词常用于提示最后两个音谐，分为完全终止，变格终止，半终止伪终止。