Answer: ① A literary school that originated in England in the mid-18th century. It exaggerates the role of emotion, has a sad style and gloomy language; ② Sentimentalism has begun to take shape in Richardson's creation, and its representative is Stine's "Sentimental Journey"; ③ Representative works of sentimentalist poetry include Thomson's "Song of the Four Seasons", Younger's "A Night of Accusation or Concerning Life, Death and Eternal Life", Gray's "A Song of the Graveside", etc.