И. В. Арнольд 145

The causes of sound interchange are twofold and one should learn to differentiate them from the historical point of view. Some of them are due to ablaut or vowel gradation characteristic of Indo-European languages and consisting in a change from one to another vowel accompanying a change of stress. The phenomenon is best known as a series of relations between vowels by which the stems of strong verbs are differentiated in grammar (drink — drank — drunk and the like). However, it is also of great importance in lexicology, because ablaut furnishes distinctive features for differentiating words. The examples are: abide v:: abode n; bear v:: burden n; bite v:: bit n; ride v:: road n; strike v:: stroke n.

The other group of cases is due to an assimilation process conditioned by the phonemic environment. One of these is vowel mutation, otherwise called umlaut, a feature characteristic of Germanic languages, and consisting in a partial assimilation to a succeeding sound, as for example the fronting or raising of a back vowel or a low vowel caused by an [i] or [j] originally standing in the following syllable but now either altered or lost. This accounts for such oppositions as full a:: fill v; whole a:: heal v; knot n:: knit v; tale n:: tell v. The process will be clear if we follow the development of the second element in each pair. ModE fill<OE fyllan; heal < hælan <*hailjan cognate to the OE hal; tell<OE tellan<*tallian; knit<OE cnyttan is especially interesting, as OE cnotta is akin to ON knūtr, knot, knötr ‘ball’ and to the Russian кнут which is ‘a lash of knotted things’.

The consonant interchange was also caused by phonetic surroundings. Thus, the oppositions speak v:: speech n; bake v:: batch n; or wake v:: watch n are due to the fact that the palatal OE [k] very early became [tS] but was retained in verbs because of the position before the consonants [s] and [θ] in the second and third persons singular.

A voiced consonant in verbs contrasting with an unvoiced one in nouns results from the fact that in ME verbs this final of the stem occurred in intervocalic positions which made it voiced, whereas in nouns it ended the word or was followed by a consonant ending. After the loss of endings the voicedness was retained and grew into a distinctive feature. There is a long series of cognate verbs and nouns and also some adjectives differing in this way. Observe, for example, the opposition of voiced and unvoiced consonants in the following: advise v:: advice n; bathe v:: bath n; believe v:: belief n; clothe v:: cloth n; glaze v:: glass n; halve v:: half n; live v:: life n; loathe v:: loath n and a; lose v:: loss n, loose a; prove v:: proof nand a; serve v:: serf n; shelve v:: shelf n; wreathe v:: wreath n.

As to the difference in the root vowels of these verbs and nouns, it is caused by the fact that the root syllable in verbs was open, whereas in nouns it was closed. Observe the analogy between plurals in [-vz] correlated with singulars in [-f] and verbs in [-v] correlated with nouns in [-f ]: shelf n sing. — shelves n pl. — shelve v.¹

¹ O. Jespersen in “A Modern English Grammar on Historical Principles” (pt. VI, p. 200) points out that if the plural of a noun ends in - fs, a derived verb never has a voiced final consonant: dwarf n — dwarf v; roof n — roof v.

It will be recalled in this connection that the systematic character of the language may manifest itself in the analogy between word-building processes and word inflection. It is worthy of note that not only are these processes similar, but they also develop simultaneously. Thus, if some method is no longer productive in expressing grammatical categories, we shall also observe a parallel loss of productivity in expressing lexical meaning. This is precisely the case with root inflection. Instances of root inflection in the formation of the plural of nouns (goose — geese, foot — feet, tooth — teeth) or the Past Indefinite and Participle II of verbs (sing — sang — sung, drive — drove — driven, tear — tore — torn) exist in the language as the relics of past stages; and although in the case of verbs the number of ablaut forms is still very great, no new verbs are inflected on this pattern.

The same may be said about word-building by sound interchange. The type is not productive. No new words are formed in this way, yet sound interchange still stays in the language serving to distinguish one long-established word from another.

Synchronically, it differentiated parts of speech, i.e. it may signal the non-identity of words belonging to different parts of speech: full a:: fill v; food n:: feed v; or to different lexico-grammatical sets within the same part of speech: fall intransitive v:: fell causative v; compare also lie:: lay, sit:: set, rise:: raise.

Derivation often involves phonological changes of vowel or consonant: strong sl:: strength n; heal v:: health n; steal v:: stealth n; long a:: length n; deep a:: depth n.

Major derivative alternations involving changes of vowel and /or consonant and sometimes stress shift in borrowed words are as follows: delicacy n:: delicate a; piracy n:: pirate n; democracy n:: democrat n; decency n:: decent a; vacancy n:: vacant a; creation n:: create v; edify v:: edification n; organise v:: organisation n; agnostic a:: agnosticism n.

Some long vowels are retained in quality and quantity; others are shortened, and there seems to be no fixed rule, e.g. [a:] tends to be retained: artist n:: artistic а; [э:] is regularly shortened: ‘ permit n:: per'mit v.

§ 7.5 DISTINCTIVE STRESS

Some otherwise homographic, mostly disyllabic nouns and verbs of Romanic origin have a distinctive stress pattern. Thus, ' conduct n ‘behaviour’ is forestressed, whereas con'duct v ‘to lead or guide (in a formal way)’ has a stress on the second syllable. Other examples are: accent, affix, asphalt, compact (impact),¹ compound, compress (impress), conflict, contest, contract (extract), contrast, convict, digest, essay, export (import, transport), increase, insult, object (subject, project), perfume, permit, present, produce, progress, protest, rebel, record, survey, torment, transfer.² Examples of words of more than two syllables are very few:

¹ Words of the same root are given in brackets.

² There are some meanings in which the verb is also forestressed.

10* 147

'attribute n:: a'ttribute v. Historically this is probably explained by the fact that these words were borrowed from French where the original stress was on the last syllable. Thus, ac'cent comes through French from Latin ac'centus. Verbs retained this stress all the more easily as many native disyllabic verbs were also stressed in this way: be come, be'lieve, for'bid, for'get, for'give. The native nouns, however, were forestressed, and in the process of assimilation many loan nouns came to be stressed on the first syllable.

A similar phenomenon is observed in some homographic pairs of adjectives and verbs, e.g. ‘ absent a:: ab’sent v; ‘ frequent a:: fre'quent v; ‘ perfect a:: per'fect v; ‘ abstract a:: ab’stract v. Other patterns with difference in stress are also possible, such as arithmetic [э'riθ-mэtik] n:: arithmetical) [эпθ'metik(эl)] a. The fact that in the verb the second syllable is stressed involves a phonemic change of the vowels as well: [э/ае] and [э/i].

This stress distinction is, however, neither productive nor regular. There are many denominal verbs that are forestressed and thus homonymous with the corresponding nouns. For example, both the noun and the verb comment are forestressed, and so are the following words: exile, figure, preface, quarrel, focus, process, program, triumph, rivet and others.

There is a large group of disyllabic loan words that retain the stress on the second syllable both in verbs and nouns: accord, account, advance, amount, approach, attack, attempt, concern, defeat, distress, escape, exclaim, research, etc.

A separate group is formed by compounds where the corresponding combination of words has double stress and the compound noun is forestressed so that the stress acquires a word-building force: ‘ black ‘ board:: ‘ blackboard and ‘ draw'back:: ‘ drawback.

It is worth noting that stress alone, unaccompanied by any other differentiating factor, does not seem to provide a very effective means of distinguishing words. And this is, probably, the reason why oppositions of this kind are neither regular nor productive.

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