简单句和复合句
一、主系表复杂难句
Vitamins are organic compounds.
Vitamins are organic compounds necessary for the normal growth of life.
Vitamins are organic compounds necessary for the normal growth of life of animals, including man.
Vitamins are organic compounds necessary in small amounts in the diet for the normal growth of life of animals, including man. 维他命是人和动物在日常的饮食生活中所需的一种微量的有机化合物。

主谓
This trend began during the Second World War.
This trend began during the Second World War, when several governments came to this conclusion.
This trend began during the Second World War, when several governments came to this conclusion that the specific demands cannot generally foreseen in detail.
This trend began during the Second World War, when several governments came to this conclusion that the specific demands that a government wants to make of its scientific establishment cannot generally foreseen in detail.
这种趋势发生在二战时，当时许多政府总结出：政府对科学建立的具体要求并不能被普遍的详细预见
主谓宾
The emphasis helped to obscure the great importance.
The emphasis given by both scholars and statesmen helped to obscure the great importance.
The emphasis given by both scholars and statesmen to the presumed disappearance of the American frontier helped to obscure the great importance.
The emphasis given by both scholars and statesmen to the presumed disappearance of the American frontier helped to obscure the great importance of changes in the conditions and consequences of international trade.
学者和政治家同时强调:假设美国边境的消失并不能对国际贸易的状况和影响产生重大的改变。

The emphasis given by both scholars and statesmen to the presumed disappearance of the American frontier helped to obscure the great importance of changes in the conditions and consequences of international trade that occurred during the second half of the nineteenth century.
学者和政治家同时强调:假设美国边境的消失并不能对在十九世纪下半年期间的国际贸易的状况和影响产生重大的改变。

主谓双宾
Her work won her the Nobel Prize in 1983.
Her work in genetics won United States scientist Barbara McClintock the Nobel Prize in 1983.
美国科学家Barbara McClintock的关于遗传学的作品获得了1983年的诺贝尔奖
主谓宾宾补
Willa Cather considered this novel her best work.
Willa Cather considered her novel of life in nineteenth – century Nebraska, My Antonia her best work. Willa Cather认为《Nebraska, My Antonia》是她在19世纪小说生涯中最好的作品。

从简单词到复合句
主语句子充当主语主语从句
宾语句子充当宾语宾语从句句词性从句
表语句子充当表语表语从句
同位语句子充当同位语同位语从句
三大类基本从句定语句子充当定语定语从句
状语句子充当状语状语从句。