Basic to any understanding of Canada in the 20 years after the Second World War is the country's impressive population growth．
细看这个句子，我们不难发现其主干结构：Basic … is the country’s impressive population growth. 很明显，这个句子是倒装句，形容词开头，主语在句末。这种情况的出现，一是为了强调开头的形容词，二是因为主语太长（有定语从句或长修饰词修饰）。
Basic to any understanding of the relevant knowledge used in the assignment after class is the knowledge imparted by teachers in the class.
题目：People succeed because of hard work. Luck has nothing to do with success.
It is universally acknowledged that hard work is indispensable to success. Students study for years before they are admitted into top universities. Scientists toil for years before they make a major discovery. Self-made people work for years before they finally make a fortune. However, less well-known is the role that luck plays in achieving one’s goal.
在上面的首段最后一句话中，应用了刚刚阅读中的长难句句式（形容词放句首的倒装句），将前面的形容词改为less well-known, 即“鲜为人知的”。显而易见，在积累并熟悉阅读长难句当中的经典句式之后，我们更容易写出地道、流利、高级的好句子。
Accustomed though we are to speaking of the films made before 1927 as “silent”, the film has never been, in the full sense of the word, silent.
分析这个句子，我们不难发现，主句是“the film has never been silent”, 而前半句“accustomed though we are to speaking of the films as silent”是一个不完全的倒装句，原句应该是“although we are accustomed to speaking of the films as silent”。也就是说，如果用though引导让步状语从句，从句当中就可以倒装。进一步补充，把though换成as, 也有同样的作用。
题目：Parents should allow children to make decisions by themselves.
First off, encouraging children to make their own decisions offers them opportunities to develop independence. Accustomed though children are to turning to their parents for help once they have trouble doing something, they should not miss out on opportunities to grow up independently. By making their own decisions, children will analyze the situationsappropriately, seek out ways to solve the problems by themselves and learn to distinguish right from wrong—all these contribute to the independence of children in the near future. Last October, a piece of striking news appeared on the local newspaper, saying that a kid was left on the street for 4 hours, waiting for his parents to pick up him. When the police came up to him, he said he had no idea where to go because his parents’ phone was out of service and he had no one to turn to for help. To trace back causes, his parents were to blame. Every time the child had questions or problems, his parents required him to ask them first for solutions, never allowing him to make any decisions on his own. Therefore, the result of helping children do everything including making decisions is the inability of children to independently tackle problems when necessary.