四行诗

四行诗（英文：Quatrain，又称四行連、四行連句）是一种欧洲常见的诗节体裁，每一首诗有4行。押韵构成是aabb、abab、abba、abcb。

基本形式 
aabb
 Tyger! Tyger! burning bright
 In the forests of the night,
 What immortal hand or eye
 Could frame thy fearful symmetry?
abab
 "The wind doth blow today, my love
 And a few small drops of rain;
 I never had but one true-love
 In cold grave she was lain.
abba
 Strong Son of God, immortal Love,
 Whom we, that have not seen thy face,
 By faith, and faith alone, embrace,
 Believing where we cannot prove;
abcb
 There lived a wife at Usher's Well,
 And a wealthy wife was she;
 She had three stout and stalwart sons,
 And sent them over the sea.
aaba
 Awake! for Morning in the Bowl of Night,
 Has flung the Stone that puts the stars to flight:
 And Lo! the Hunter of the East has caught
 The Sultan's Turret in a Noose of light.

诗体