WORD STRUCTURE IN MODERN ENGLISH I. The morphological structure of a word. Morphemes. Types of morphemes. Allomorphs. II. Structural types of words. III. Principles of morphemic analysis. IV. Derivational level of analysis. Stems. Types of stems. Derivational types of words. I. The morphological structure of a word. Morphemes. Types of Morphemes. Allomorphs.
    There are two levels of approach to the study of word- structure: the level of morphemic analysis and the level of derivational or word-formation analysis.
    Word is the principal and basic unit of the language system, the largest on the morphologic and the smallest on the syntactic plane of linguistic analysis.
    It has been universally acknowledged that a great many words have a composite nature and are made up of morphemes, the basic units on the morphemic level, which are defined as the smallest indivisible two-facet language units.
    The term morpheme is derived from Greek morphe "form "+ -eme. The Greek suffix -eme has been adopted by linguistic to denote the smallest unit or the minimum distinctive feature.
    The morpheme is the smallest meaningful unit of form. A form in these cases a recurring discrete unit of speech. Morphemes occur in speech only as constituent parts of words, not independently, although a word may consist of single morpheme. Even a cursory examination of the morphemic structure of English words reveals that they are composed of morphemes of different types: root-morphemes and affixational morphemes. Words that consist of a root and an affix are called derived words or derivatives and are produced by the process of word building known as affixation (or derivation).
    The root-morpheme is the lexical nucleus of the word; it has a very general and abstract lexical meaning common to a set of semantically related words constituting one word-cluster, e.g. (to) teach, teacher, teaching. Besides the lexical meaning root-morphemes possess all other types of meaning proper to morphemes except the part-of-speech meaning which is not found in roots.
    Affixational morphemes include inflectional affixes or inflections and derivational affixes. Inflections carry only grammatical meaning and are thus relevant only for the formation of word-forms. Derivational affixes are relevant for building various types of words. They are lexically always dependent on the root which they modify. They possess the same types of meaning as found in roots, but unlike root-morphemes most of them have the part-of-speech meaning which makes them structurally the important part of the word as they condition the lexico-grammatical class the word belongs to. Due to this component of their meaning the derivational affixes are classified into affixes building different parts of speech: nouns, verbs, adjectives or adverbs.
    Roots and derivational affixes are generally easily distinguished and the difference between them is clearly felt as, e.g., in the words helpless, handy, blackness, Londoner, refill, etc.: the root-morphemes help-, hand-, black-, London-, fill-, are understood as the lexical centers of the words, and -less, -y, -ness, -er, re- are felt as morphemes dependent on these roots.
    Distinction is also made of free and bound morphemes.
    Free morphemes coincide with word-forms of independently functioning words. It is obvious that free morphemes can be found only among roots, so the morpheme boy- in the word boy is a free morpheme; in the word undesirable there is only one free morpheme desire-; the word pen-holder has two free morphemes pen- and hold-. It follows that bound morphemes are those that do not coincide with separate word- forms, consequently all derivational morphemes, such as -ness, -able, -er are bound. Root-morphemes may be both free and bound. The morphemes theor- in the words theory, theoretical, or horr- in the words horror, horrible, horrify; Angl- in Anglo-Saxon; Afr- in Afro-Asian are all bound roots as there are no identical word-forms.
    It should also be noted that morphemes may have different phonemic shapes. In the word-cluster please , pleasing , pleasure , pleasant the phonemic shapes of the word stand in complementary distribution or in alternation with each other. All the representations of the given morpheme, that manifest alternation are called allomorphs/or morphemic variants/ of that morpheme.
    The combining form allo- from Greek allos "other" is used in linguistic terminology to denote elements of a group whose members together consistute a structural unit of the language (allophones, allomorphs). Thus, for example, -ion/ -tion/ -sion/ -ation are the positional variants of the same suffix, they do not differ in meaning or function but show a slight difference in sound form depending on the final phoneme of the preceding stem. They are considered as variants of one and the same morpheme and called its allomorphs.
    Allomorph is defined as a positional variant of a morpheme occurring in a specific environment and so characterized by complementary description.
    Complementary distribution is said to take place, when two linguistic variants cannot appear in the same environment.
    Different morphemes are characterized by contrastive distribution, i.e. if they occur in the same environment they signal different meanings. The suffixes -able and -ed, for instance, are different morphemes, not allomorphs, because adjectives in -able mean " capable of beings".
    Allomorphs will also occur among prefixes. Their form then depends on the initials of the stem with which they will assimilate. ............