抓住句子的結構是十分重要的，有些句子的并列結構是我們需要敏銳的看出的（在SAT 文法題中考察對并列成分的抓取），比如在官方指南上的一篇閱讀文章Artisans and Industrialization 的一句話就有比較復雜的并列結構，這句話介紹了19世紀美國學徒Apprentice和匠人師傅之間的關系：
Apprentices were considered part of the family, and masters were responsible not only for teaching their apprentices a trade but also for providing them some education and for supervising their moral behavior.

生詞積累
1. Supervise: v. 監督，近義詞 oversee
2. Moral: adj 道德的
 
總體來說，這個句子是個并列句。前半部分：Apprentices were considered part of the family 就是說學徒被當做（師傅的）家人。（是不是和我們中國很像）
 
我們關鍵看看這個句子的后半句 masters were responsible not only for teaching their apprentices a trade but also for providing them some education and for supervising their moral behavior. 這句話有很多 for 引導的短語，這會使得一些同學們感到頭疼。
 
大家還要抓住并列結構 not only, but also, and 并且明白它們的功能是連接意義相關、層次相同、語法結構也相同的結構。那么這三個 for 引導的介詞短語，它們的層次和語法結構都相同，很明顯都是并列關系。大家需要注意，有時候并列關系不僅僅是并列兩項，還有可能并列多項。我們把并列關系都標出來，結構如下：
 
masters were responsible not only for teaching their apprentices a trade but also for providing them some education and for supervising their moral behavior.

我們知道 be responsible for （對……負責）的結構，并且三個for引導的介詞短語是并列關系。所以這句話講解的是師傅要對三件事情負責。句子含義是：師傅對教學徒一個行業、提供學徒一定的教育和監管他們的道德行為負責。