Morphological Analysis

Stems and words

It is common to distinguish between

  • words: the individual elements found in sentences, and
  • stems: the individual elements found in the lexicon that may be put together to form sentences

We can say that

  • derivational morphology describes the processes that form stems (the items in the lexicon)
    stem formation
  • inflectional morphology describes the processes that form words per se (the final form of lexical items in sentences):

word formation

English

  • very little inflectional morphology
  • limited to the final suffix of words
  • the highest stem of any English word can be recovered by removing the inflectional suffix

word = stem + (inflectional suffix)

lights = light + (-s)

  • many English words have no inflectional suffix, and
  • areidentical to their stems

light (word) = light (stem)

  • insofar as a stem is derived, its root can be recovered by removing its derivational affix:

stem = root + (derivational affix)

receive = re- + -ceiveroot

  • many English stems have no inflectional suffix
  • identicalto their roots

light (stem) = lightroot

  • insofar as stems are formed from other stems, the following formula is true as well:

stem = stem + derivational affix

stem fiendish = stem fiend + derivational suffix -ish

  • as a practical matter, in analyzing stems, after removing a derivational element, ask if what is left can be used in a sentence:
  1. YES  stem (i.e., stems are lexical items and lexical items are things used in sentences), and continue analysis
  1. NO root, and the analysis is complete.

Examples

Conventions

1. We label the part of speech of the word (W) to be analyzed

2. We label each smaller constituent as:

  • stem (S)
  • inflectional suffix (IA)
  • derivational affix (DA)
  • root

3. We label the part of speech of each stem.

4. We label each inflection suffix for its meaning.

5. We label each derivational affix as to the part of speech of the stem it creates.

Example 1:N arm

  • the simplest type of English word
  • derivational or inflectional affixes
  • it is identical to its stem and root

W-N( S-N( Root( arm ) ) )

Example 2:N arms

W-N( S-N( Root( arm ) ) IA-pl( -s ) )

Example 3:N armies

W-N( S-N( S-N( Root( arm ) DA-N( -y ) ) IA-pl( -s ) )

  • N army - the "highest" stem of N armies (the lexical item of which it is the plural form)
  • N army contains the N stem arm, from which it has been derived
  • armies, army, arms, and arm share the same root arm.

Hence:

  • A stem can be regarded as the common denominator of a group of inflectionally related forms.
  • A root can be regarded as the common denominator of a group of derivationally related stems.