Types of morphemes: inflectional, wordforming, root, affixal

Morpheme. What does it mean?
Morpheme is the smallest language unit that has essential features of a language,so it has both external (sound) and internal (meaning) sides.

Types of morpheme:
Root morpheme is a root morpheme is a morpheme that conveys a specific real meaning that is common to a group of related words, for example:
to teach, teacher, teaching, etc.

Morphemes that have a more abstract categorical meaning are called affixes. Affixes relate a word to larger ones
word categories. For example, in the word driver, the specific real meaning is passed by the root drive, while the affix-er is abstract and includes this word in the lexical class with the General meaning " activist "and the grammatical class"noun".
driver: the root - drive, affix - er;
helpless - the affix refers this word to a class of adjectives with the General meaning "devoid of any quality or attribute".

Affixes by place in the word are divided into:
Prefixes (they precede the root)
Suffixes (they follow it).
Interfixes (serve to connect the roots of complex word):
-s- in the wors sportsman

Affixes divides into:
Word-forming (formation of new words):
paint - painter
Inflectional (changing the grammatical forms of the same word):
boy - boys, boy’s, boys’

The root and wor-forming affixes are distinguished in a word:
rest-less; cloud-y; black-ness; London-er
The root is more clearly distinguished if the language has a word that externally combines with it (homonymous):
pleas-ant/un-please-ant, to please/ to displease, please-ure

Connected root:
the root of scrip/scrib in the words:
de-scribe, pre-scribe, in-scribe, in-scrip-tion, pre-scrip-tion
So, morphemes can be independent units (roots), while affixal morphemes are always connected.