Word Roots are a Part of History. "Histories Make Men Wise" -- Bacon.

下表列有30个最常见的英语单词后缀 (按使用频率由大到小排列)。
为了探究词典中到底有多少个英语单词在使用这些单词后缀, 以及它们的频率， 我们开发了计算机程序，仔细查看了我们词典中从 ravens 到 zygotic 的每个字， 共查看了12603 个字.
结果如下：
发现共有6151 个各异的基本单词在使用这些后缀, 一个基本单词可使用不同的后缀。一个基本单词若正确地使用了后缀后， 它就变成了词典中的另外的一个单词。 词典中总共有11823个单词使用了这些后缀。
这说明这些后缀可以很有效地把词典中的一个单词扩展成另外一个单词。 扩展率是：
11823/6151 = 1.92
这说明了比如说你已经懂了100个英语单词， 通过使用下表中的后缀， 你就可以马上把你的词汇量扩展了1.92倍！ 再加上你原来就懂的100个单词， 你现在的词汇总量就是： 100 + 100 * 1.92 = 292
也就是说你的词汇 总扩展系数 平均是 2.92 ！通过学习这些简单的后缀来扩展你的词汇很有效！
但如果你不懂任何英语单词， 那么你的总扩展系数还是0.
正确切分或拆解一个英语单词的第一步就是要正确地认识单词中的前缀和后缀。 更多有用的英语单词前缀和后缀列于第五和第六部分。

There are 30 most frequently used English suffixes in the table below in the order of frequency.
To figure out how the suffixes are applied to English words and their frequencies, we create computer programss to check every word from ravens through zygotic in our dictionary, a total of 12603 words.
There are 6151 unique basic words to which the suffixes are applied, one basic word may have more than one suffixes applied. Once a suffix is correctly applied to a basic word in the dictionary, the basic word becomes another word in the dictionary.
The total nubmer of English words that have the suffixes applied is 11823. This means that the suffixes in the table below can effectively expand some words into some other words in the Dictionary. The expansion ratio is:
11823/6151 = 1.92
which means that if you already know the meanings of 100 words, by applying the suffixes in the table below, then you can instantly expand your vocabulary by up to 1.92 times on average! Considering that you already know the 100 words, now the size of your vocabulary is 100 + 100 * 1.92 = 292
which means that the grand expansion ratio of your vocabulary by just learning these suffixes is: 2.92 times on average! How effective this is!
However if you know no words, then your grand expansion ratio is still zero.
The first step to correct dissect an English word is to correct recognize the prefix and suffix in it. More useful prefixes and suffixes are given in Part 5 and Part 6.