51. Any medical test will sometimes fail to detect a condition when it is present and indicate that it is present when it is not.
主语谓语2个，宾语2个。That宾语从句。
52. Unlike Gertrude Stein, Ezra Pound, and other expatriates, William Carlos Williams insisted that poets honor their own regions and employ specifically American rhythms.
主语谓语宾语。That宾语从句。介词+名词作状语。
53. Critics of the trend toward privately operated prisons consider corrections facilities an integral part of the criminal justice system and question whether profits should be made from incarceration.
主语谓语x2宾语x2。宾语1的补语？？ Whether疑问词从句作宾语2，其中的主语谓语状语。
54. In 1791 Robert Carter III, one of the wealthiest owners in Virginia, stunned his family, friends, and neighbors by filing a deed of emancipation, setting free the more than 500 slaves who were legally considered his property.
主语谓语和宾语。主语的同位语。By XXX 和Ing形式作为伴随，状语。其中，宾语是more than 500 slaves，who定语从句形容宾语。
55. George Sand (Aurore Lucile Dupin) was one of the first European writers to consider the rural poor legitimate subjects for literature and to portray them with sympathy and respect in her novels.
主语谓语表语。To consider XXX and to portray them是表语的定语？？consider的宾语
宾语的补语
portray的状语
56. The company announced that its profits declined much less in the second quarter than analysts had expected and that its business would improve in the second half of the year. 主语谓语宾语。That宾语从句x2。宾语从句1的主语谓语和状语。宾语从句2的主语和谓语。
57. The report on the gross national product – the nation’s total production of goods and services – showed that second-quarter inflation was somewhat lower than previously estimated and that the savings rate was slightly higher.
主语谓语和宾语从句X2。状语。破折号中间的插入语，是状语中的名词的解释。宾语从句中的主谓表。宾语从句2中的主谓表。状语。定语。
58. Analysts blamed May’s sluggish retail sales on unexciting merchandise as well as the weather, which was colder and wetter than usual in some regions, slowing sales of barbecue grills and lawn furniture.
主语谓语宾语。On XXX as well as XXX补语？？？
Which定语从句修饰weather slowing XXX 是was的状语。
