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Simple  stems  are  semantically  non-motivated  and  do  not
                            constitute  a  pattern  on  analogy  with  which  new  stems  may  be
                            modeled  (e.g.  pocket,  motion,  receive,  etc.).  Simple  stems  are
                            generally  monomorphic  and  phonetically  identical  with  the  root
                            morphemes (sell, grow, kink, etc.).
                                  Derived stems are built on stems of various structures, they
                            are motivated, i.e. derived stems are understood on the basis of the
                            derivative relations between their immediate constituents and the
                            correlated  stems.  Derived  stems  are  mostly  polymorphic  (e.g.
                            governments, unbelievable, etc.).
                                  Compound  stems  are  made  up  of  two  immediate
                            constituents, both of which are themselves stems, e.g. match-box,
                            pen-holder, ex-film-star, etc. It is built by joining two stems, one
                            of which is simple, the other is derived.
                                  The derivational types of words are classified according to
                            the structure of their stems into simple, derived and compound
                            words. Derived words are those composed of one root-morpheme
                            and one or more derivational morphemes. Compound words have
                            at  least  two  root-morphemes,  the  number  of  derivational
                            morphemes being insignificant.
                                  The  morpheme, and therefore the affix, which  is a type of
                            morpheme,  is  generally  defined  as  the  smallest  indivisible
                            component of the word possessing a meaning of its own. Meanings
                            of affixes are specific and considerably differ from those of root
                            morphemes. Affixes have widely generalized meanings and refer
                            the  concept  conveyed  by  the  whole  word  to  a  certain  category,
                            which is all-embracing. So, the noun-forming suffix -er could be
                            roughly  defined  as  designating  persons  from  the  object  of  their
                            occupation or labor (painter – the one who paints) or from their
                            place  of  origin  (southerner  –  the  one  living  in  the  South).  The
                            adjective-forming  suffix  –ful  has  the  meaning  of  "characterized
                            by" (beautiful, careful)
                                  The semantic distinctions of words produced from the same
                            root by means of different affixes are also of considerable interest,













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