英语词汇学系列讲座（英）_小升初语法

　　3．Growth of Present-day English Vocabulary

　　1）Major Causes of Present-day English Vocabulary Expansion

　　（1） the rapid development of modern science and technology

　　（2）the social, economic and political changes

　　（3）the influence of other cultures and languages

　　4．Modes of Vocabulary Development

　　1） creation: It refers to the use of existing materials such

　　as the word-forming stems to create new words.

　　2） semantic change: It means that an old form picks up a new

　　meaning.

　　3）borrowing: It means borrowing words from other languages.

　　Chapter 3

　　Word Formation I

　　1．Morphemes

　　Morphemes are the smallest meaningful units of a language.

　　2．Allomorphs

　　Some morphemes are realized by more than one morph. Such alternative morphs of a morpheme are called allomorphs.

　　3．Types of Morphemes

　　1） Free Morphemes

　　Free morphemes are those which usually have complete meanings in themselves and can be used freely or independently as words.

　　2） Bound Morphemes

　　Bound morphemes have to be bound with other morphemes to form words and can not be used independently as words.

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