The main function of prefixes in English is to change the lexical meaning of the same part of speech. But the recent research showed that about twenty-five prefixes in Modern English form one part of speech from another (bebutton, interfamily, postcollege etc).

Prefixes can be classified according to different principles :

1. Semantic classification :

a) prefixes of negative meaning, such as : in- (invaluable), non- (nonformals), un- (unfree) etc,

b) prefixes denoting repetition or reversal actions, such as: de- (decolonize), re- (revegetation), dis- (disconnect),

c) prefixes denoting time, space, degree relations, such as : inter- (interplanetary) , hyper- (hypertension), ex- (ex-student), pre- (pre-election), over- (overdrugging) etc.

2. Origin of prefixes:

a) native (Germanic), such as: un-, over-, under- etc.

b) Romanic, such as : in-, de-, ex-, re- etc.

c) Greek, such as : sym-, hyper- etc.

When we analyze such words as : adverb, accompany where we can find the root of the word (verb, company) we may treat ad-, ac- as prefixes though they were never used as prefixes to form new words in English and were borrowed from Romanic languages together with words. In such cases we can treat them as derived words. But some scientists treat them as simple words. Another group of words with a disputable structure are such as : contain, retain, detain and conceive, receive, deceive where we can see that re-, de-, con- act as prefixes and -tain, -ceive can be understood as roots. But in English these combinations of sounds have no lexical meaning and are called pseudo-morphemes. Some scientists treat such words as simple words, others as derived ones.

There are some prefixes which can be treated as root morphemes by some scientists, e.g. after- in the word afternoon. American lexicographers working on Webster dictionaries treat such words as compound words. British lexicographers treat such words as derived ones.

COMPOSITION

Composition is the way of wordbuilding when a word is formed by joining two or more stems to form one word. The structural unity of a compound word depends upon : a) the unity of stress, b) solid or hyphonated spelling, c) semantic unity, d) unity of morphological and syntactical functioning. These are charachteristic features of compound words in all languages. For English compounds some of these factors are not very reliable. As a rule English compounds have one uniting stress (usually on the first component), e.g. hard-cover, best-seller. We can also have a double stress in an English compound, with the main stress on the first component and with a secondary stress on the second component, e.g. blood-vessel. The third pattern of stresses is two level stresses, e.g. snow-white,sky-blue. The third pattern is easily mixed up with word-groups unless they have solid or hyphonated spelling.

Spelling in English compounds is not very reliable as well because they can have different spelling even in the same text, e.g. war-ship, blood-vessel can be spelt through a hyphen and also with a break, iinsofar, underfoot can be spelt solidly and with a break. All the more so that there has appeared in Modern English a special type of compound words which are called block compounds, they have one uniting stress but are spelt with a break, e.g. air piracy, cargo module, coin change, pinguin suit etc.

The semantic unity of a compound word is often very strong. In such cases we have idiomatic compounds where the meaning of the whole is not a sum of meanings of its components, e.g. to ghostwrite, skinhead, brain-drain etc. In nonidiomatic compounds semantic unity is not strong, e. g., airbus, to bloodtransfuse, astrodynamics etc.

English compounds have the unity of morphological and syntactical functioning. They are used in a sentence as one part of it and only one component changes grammatically, e.g. These girls are chatter-boxes. «Chatter-boxes» is a predicative in the sentence and only the second component changes grammatically.

There are two characteristic features of English compounds:

a) Both components in an English compound are free stems, that is they can be used as words with a distinctive meaning of their own. The sound pattern will be the same except for the stresses, e.g. «a green-house» and «a green house». Whereas for example in Russian compounds the stems are bound morphemes, as a rule.

b) English compounds have a two-stem pattern, with the exception of compound words which have form-word stems in their structure, e.g. middle-of-the-road, off-the-record, up-and-doing etc. The two-stem pattern distinguishes English compounds from German ones.

WAYS OF FORMING COMPOUND WORDS.

Compound words in English can be formed not only by means of composition but also by means of :

a) reduplication, e.g. too-too, and also by means of reduplicatin combined with sound interchange , e.g. rope-ripe,

b) conversion from word-groups, e.g. to micky-mouse, can-do, makeup etc,

c) back formation from compound nouns or word-groups, e.g. to bloodtransfuse, to fingerprint etc ,

d) analogy, e.g. lie-in ( on the analogy with sit-in) and also phone-in, brawn-drain (on the analogy with brain-drain) etc.

CLASSIFICATIONS OF ENGLISH COMPOUNDS

1. According to the parts of speech compounds are subdivided into:

a) nouns, such as : baby-moon, globe-trotter,

b) adjectives, such as : free-for-all, power-happy,

c) verbs, such as : to honey-moon, to baby-sit, to henpeck,

d) adverbs, such as: downdeep, headfirst,

e) prepositions, such as: into, within,

f) numerals, such as : fifty-five.

2. According to the way components are joined together compounds are divided into:

a) neutral, which are formed by joining together two stems without any joining morpheme, e.g. ball-point, to windowshop,

b) morphological where components are joined by a linking element : vowels «o» or «i» or the consonant «s», e.g. {«astrospace», «handicraft», «sportsman»),

c) syntactical where the components are joined by means of form-word stems, e.g. here-and-now, free-for-all., do-or-die .

3. According to their structure compounds are subdivided into:

a) compound words proper which consist of two stems, e.g. to job-hunt, train-sick, go-go, tip-top ,

b) derivational compounds, where besides the stems we have affixes, e.g. ear-minded, hydro-skimmer,

c) compound words consisting of three or more stems, e.g. cornflower-blue, eggshell-thin, singer-songwriter,

d) compound-shortened words, e.g. boatel, tourmobile, VJ-day, motocross, intervision, Eurodollar, Camford.

4. According to the relations between the components compound words are subdivided into :

a) subordinative compounds where one of the components is the semantic and the structural centre and the second component is subordinate; these subordinative relations can be different: