13. Content words are changing all the time whereas functional words are stable.
14. In Old English there was more agreement between sound and form.
15. A word is a symbol that represents something else in the world.
form. But their meanings are borrowed. In other words, English has borrowed a new meaning for
an existing word in the language
11. argot（黑话）: It generally refers to the jargon of criminals.
12. content words（实词）: Content words denote clear notions including nouns, verbs, adjectives, adverbs and numerals.
13. terminology(术语): Terminology consists of technical terms used in particular disciplines and academic areas.
14. native words（本族语）: Native words, also known as Anglo-Saxon words, are words brought to Britain in the 5th century by the German tribes.
论述问答题：
1. With the development of the Language, why do more and more differences occur between the Sound and Form?
答：It is generally agreed that the written form of a natural Language is the written record of the oral form. But with the development of the Language, more and more differences occur between them, the reasons are as follows:
①. The internal reason for this is that the English alphabet was adopted from the Romans, which does not have a separate letter to represent each sound in the Language so that some letters must do double duty or work together in combination.
②. Another reason is that the pronunciation has changed more rapidly than spelling over the years, and in some cases the two have drawn far apart.
③. A third reason is that some of the differences were created by the early scribes.
④. Finally comes the borrowing, which is an important channel of enriching the English vocabulary. When English borrowed words from other Languages , it borrowed spelling as well.
2. What are the obvious characteristics of the words of the basic word stock（基本词汇）?
①. All national character.（全民性）
②. Stability（稳定性）
③. Productivity（多产性）
④. Polysemy（多义性）
⑤. Collocability（搭配性）
Of course, not all the words of the basic word stock have these characteristics. Pronouns and numerals enjoy nation-wide use and stability, but are semantically monosemous and have limited productivity and collocability. Therefore, ‗all national character‘is the most important of all features that may differentiate words of common use from all others.
3. Apart from the characteristics mentioned of the basic word stock, in contrast to borrowed words, native words have two other features, what are they?
