声音和形式之间产生差异的原因：

1.英语字母表是从罗马人那里来的，英语中音素多于字母。（The English alphabet was adopted from the Romans. There are more phonemes than letters in English.）

2.发音比拼写变化快。（The pronunciation has changed more rapidly than spelling.）

3.有些拼写差异是由早期的手抄员造成的。（Some of the differences were created by the early scribes.）

4.印刷术使得单词的拼写得以定形，但声音仍继续改变。（Printing became well established. Sounds continue to change as usual.）

5.外来词是丰富英语词汇的重要途径。（The borrowings is an important channel of enriching the English vocabulary.）