２人の人物が通例１行ずつの詩で交互に対話していく形式

* Cassandra: ‘Tis Agamemnon's doom thou shalt behold. Chorus: Peace, hapless woman, to thy boding words ! Cassandra: Far from my speech stands he who sains and saves. Chorus: Ay-were such dooms at hand which God borbid !――Aeschylus, Agamemnon

* 『大修館英語学事典』（松浪有・池上嘉彦・今井邦彦[編] ／大修館）