“Back-formation” refers to an abnormal type of word-formation where a shorter word is derived by detecting an imagined affix from a longer form already present in the language. It is a special kind of metanalyais, combined with analogical creation, e.g., editor→edit, enthusiasm→enthuse, etc.

82. What is analogical creation? What is borrowing?
The process of “analogical creation”, as one of the English tendencies in English word-formation, refers to the phenomenon that a new word or a new phrase is coined by analogy between a newly created one and an existing one. For example, “marathon” appeared at the First Olympic Games and by analogy modern English created such words as “telethon”, “talkthon”, etc. Analogy may create single words (e.g., sunrise-moonrise, earthrise, etc.; earthquake-starquake, youthquake, etc.) and phrases (e.g., environmental pollution-sound pollution, air pollution, cultural pollution, etc.).
“Borrowing” means the English language borrowed words from foreign languages, which fall in four categories: aliens, denizens, translation-loans and semantic borrowings.
“Aliens” are foreign loans that still keep their alien shapes, i. e., morphological and phonological features, e.g., “elite”, “coup détat”, “coupé”, etc.(from French). “Deniens” , also foreign words, have transformed their foreign appearance, i.e., they have been Angolcized (or Americanized), e. g., “get” (a Scandinavian borrowing), “theater” (a French loan), etc. “Hybrids” are also denizens, because they are words made up of two parts both from foreign soil, such as “sociology” (“socio-” from French and –logy from Greek).
“Translation-loans” are words imported by way of translation, e. g., “black humor” from French(“humor noir”), “found object” form French ,too (“object trouve”), etc. Finally, semantic borrowings have acquired new meaning under the influence of language or languages other than the source tongue. For example, “gift” mean “the price of a wife ” in Old English (450-1150AD), and after the semantic borrowing of the meaning of “gift or present” of the Scandinavian term “gipt”, it meant and still means “gift” in the modern sense of it.

83. What is assimilation, dissimilation and metathesis?
“Assimilation” refers to change of a sound as the result of the influence of an adjacent sound, which is called “contact” or “contiguous” assimilation. The assimitative processes at word in language could be explained by the “theory of least effort” ,i.e., in speaking we tend to exert as little effort as possible so that we do not want to vary too often places of articulation in uttering a sequence of sounds. Assimilation takes place in quick speech very often. In expressions such as “immobile”, “illegal”, etc., the negative prefixes should be or have been “in-” etymologically.
“Dissimilation”, opposite of assimilation, is the influence exercised by one sound segment upon the articulation of another sound, so that the sounds become less alike than expected. As there are two[r] sounds in the Latin word “peregrines”, for instance, the first segment had to dissimilate into[l], hence the English word “pilgrim”.
“Metathesis” is a process involving an alteration in the sequence of sounds. Metathesis had originally been a performance error, which was overlooked and accepted by the speech community. For instance, the word “bird” was “bird” in Old English. The word “ask” used to be pronounced [ask] in Old English, as still occurs in some English dialects.

84. What is pragmatics?
Pragmatics can be simply defined as the study of language in use. It is concerned with the study of meaning as communicated by a speaker (or writer) and interpreted by a listener (or reader). It has, consequently, more to do with the analysis of what people mean by their utterances than what the words or phrases in those utterances might mean by themselves.

85. What is speech act theory?
Speech act theory was proposed by J. L. Austin and has been developed by J. R. Searle. Basically, they believe that language is not only used to inform or to describe things, it is often used to “do things”, to perform acts.  Austin suggests three basic senses in which in saying something one is doing something and three kinds of acts are performed simultaneously:
    1) Locutionary act: the utterance of a sentence with determinate sense and reference;