What is a word？
A word is a minimal free form of a large of a language that has a given sound， meaning and syntactic fu
Prefixes are added to the front of root or base to form new words。（精品文档请下载）
Affixation， also called derivation. Is the formation of new words by adding affixes to stems. Affixation includes prefixation and suffixation according to the types of affixes used to form new words.（精品文档请下载）
Prefixaton as to create new words by adding prefixes to bases while suffixation makes new words by adding suffixes to bases。（精品文档请下载）
Conversion is the formation of new words by converting words of one class to another class（精品文档请下载）
Blending is the formation of new words by combining parts of two or a word plus a part of another word. （精品文档请下载）
2. in what way are words related to vocabulary？
Vocabulary refers to the sum total of all the words in a language。 In other words, vocabulary is composed of words and words make up vocabulary。
If we compare vocabulary to a family， words are family members。（精品文档请下载）
illustrate the relationship between sound and meaning with examples （精品文档请下载）
sound is the physical aspect of a word an meaning is what the sound refers to 。 Sound and meaning are not intrinsically related and their connection is arbitrary and conventional. For example, tree/tri：/ means 树in English ，because the English speaking people have agreed to do so just as
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