Morphology Notes: Derivational vs Inflectional Morphemes in English

Key Concepts in English Morphology

• The talk is delivered by Seth, secretary of the Speech and Linguistic Society, about course structure changes and a Careers Night (Tue, Sept 2, 5–7 PM). Registration via Instagram is mentioned.
• Focus of the content: morphology, especially how words are built from morphemes, and how hierarchical structure (not just linear order) determines meaning.
• Important distinction: surface spelling (orthography) is not the same as the underlying linguistic structure; writing systems may reflect the language but do not reveal the full hierarchical morpheme structure.
• A recurring tool in morphology is the distinction between derivational morphology (creating new words) and inflectional morphology (providing grammatical information for existing words).
• Morphemes come in affixes (prefixes, suffixes, circumfixes, infixes) and root words; many languages do not use all possible morphemes, so typological variety is expected.
• Morphological representation can be shown with tree structures, bracket notation, or the onion (nested) diagram; each captures hierarchical relationships among morphemes.
• Productivity of morphemes is a central concept: productive morphemes participate in many word-formation processes, suggesting rule-governed knowledge in the mind; less productive morphemes tend to be restricted or historic.
• Morphology is a live, debated field: questions about which morphemes are productive, how much must be memorized versus rule-based, and how linguistic knowledge is represented in the brain.
• The lecture emphasizes practical aims: understanding how morphology works helps with language learning, literacy, and explaining complex word-formation patterns you see in English.
• The content connects to broader topics: semantic meaning of affixes, syntactic category changes via derivational morphology, and the interaction between form (morphology) and grammar (syntax).

Morphology: Key Definitions

• Morpheme: the smallest unit of meaning in a language; may be free (can stand alone) or bound (must attach to another unit).
• Derivational morphology: processes that create new words by attaching derivational morphemes (often changing the syntactic category and semantic meaning).
• Inflectional morphology: processes that add grammatical information to a word without changing its core meaning or category; adds features like tense, number, person, mood, etc.
• Affix: a bound morpheme attached to a word stem; includes prefixes, suffixes, infixes, and circumfixes.
• Productivity: the degree to which a morpheme can be used to form new words; high productivity implies rule-based generalization across many roots, reducing memorization needs.
• Open-class (content) words: nouns, verbs, adjectives, adverbs; readily admit new members.
• Closed-class (function) words: conjunctions, determiners, pronouns, auxiliaries, complementizers; limited or specialized new members.
• Syntactic category: the grammatical class a word belongs to (noun, verb, adjective, etc.); derivational morphology can change a word’s category, inflection usually does not.
• Inflectional morphemes: morphemes that mark grammatical features (e.g., number, tense, person, aspect); tend to be fewer in number and do not change lexical category.
• Onset for notation: two common ways to represent morphemes and their structure are bracket trees and onion diagrams; both capture hierarchical structure, enabling analysis of where morphemes attach and how they interact.

Derivational Morphology: How New Words Are Formed

• Derivational morphemes attach to existing words to form entirely new words, often changing syntactic category.
• Examples illustrating step-by-step derivation:
  • nation + al → national (noun to adjective)
  • national + ize → nationalize (adjective/ noun base to verb)
  • denationalize (prefix de- to remove national property) + -ed (past participle) → denationalized
• Common derivational suffixes (productive vs. less productive):
  • Suffixes that change word class and meaning: -able, -ible, -er, -or, -ment, -hood, -ness, -ish, -al, -ic, -y, -ly, -ish, -ish, -ful, -less, -ize, -ize, -ation, etc.
  • Examples:
  • -able: turns verbs into adjectives (fix → fixable; prove → provable).
  • -er / -or: agentive suffixes (painter, driver).
  • -hood: denotes a state or condition (childhood, motherhood).
  • -ness: forms a noun denoting a state or quality (kind → kindness).
  • -er, -or often indicate an agent (teacher, worker).
  • -ish: adjectives indicating a rough or approximate quality (greenish).
  • -y: adjectives from nouns or adjectives (brilliant → brilly?; more common: foggy from fog).
  • -al / -ic / -ous: create adjectives from nouns or verbs (national, logical, poisonous).
  • -ment: forms nouns from verbs (treatment from treat).
  • -ize / -ify: verbs meaning to cause to become (modernize, classify).
• Derivational morphology can change syntactic category:
  • Example: happy (adjective) → happiness (noun) via -ness.
  • Example: modern (adjective) → modernize (verb) via -ize.
• Derivational morphemes can also change the semantic core and utility of a word, not just its form.
• Arrows in derivational morphology: rewrite arrows illustrate how a derivational morpheme selects and changes a word; in a derivational derivation the left-hand side and right-hand side of the arrow may switch categories.
• Key takeaway: derivational morphology creates new words with new meanings, often with a step-by-step build-up from a root or base word.

Inflectional Morphology: Grammatical Information, Not New Lexical Meaning

• Inflectional morphemes attach to a word to encode grammatical information (tense, number, person, mood, aspect, etc.) without changing the word’s core meaning or category.
• Common inflectional morphemes in English:
  • -s: third person singular present tense on verbs; plurality on nouns (regular plural) is also -s (though the function can differ by context).
  • -ed: past tense on verbs, sometimes part of past participles.
  • -ing: present participle/gerund form on verbs.
  • -en: sometimes used for past participles (e.g., eaten, beaten).
  • -s (on nouns): plural marker; -'s: possessive marker for nouns.
  • -'s: possessive marking (e.g., the cat's toy).
  • -er / -est: comparative and superlative for adjectives (e.g., bigger, biggest).
  • -ing (on adjectives or nouns) and other forms can appear in fixed sequences as part of phrases (e.g., progressive aspect with auxiliary verbs).
• Important properties of inflectional morphemes:
  • They do not typically change the syntactic category of the word they attach to.
  • They often provide grammatical information that is required by the grammar of a sentence (e.g., third person subject agreement, tense consistency, number agreement).
  • They are the last morphemes to be added in a word (the final affixes in a word form).
  • They tend to have limited or no semantic change beyond the grammatical information they express.
• Examples discussed:
  • Walk → walks (verb with 3rd person singular present tense)
  • Jump → jumped (past tense with -ed)
  • Run → running (present participle with -ing)
  • Cat → cats (plural -s; also a separate plural irrealis in irregular forms)
  • Dog → dogs (plural; contrast with irregular plurals like ox → oxen)
  • Happy → happier → happiest (comparative and superlative via -er/-est)
• Special note on irregular/plural inflection and archaic forms:
  • Some nouns have irregular plurals (e.g., child → children; ox → oxen), which are inflectional but not productive.
  • Borrowed words often carry irregular inflectional patterns (e.g., indices, matrices, crises, curricula) that may not follow productive rules.
• Phonology-phonology interaction:
  • Inflectional morphology is sensitive to phonological word structure; for adjectives with two or more syllables, certain inflectional endings require specific stress patterns or phonological conditions.
• Practical rule: English typically allows only one inflectional morpheme per word (in most common cases), though some languages permit multiple inflectional morphemes per word. The current discussion notes this as a general tendency rather than an absolute rule across all languages.

Word Classes: Content vs Function Words

• Content words (open class): nouns, verbs, adjectives, adverbs; readily admit new members in the language.
• Function words (closed class): conjunctions, determiners, auxiliary verbs, complementizers; serve grammatical roles and help connect content words.
• Metaphor for function words: like screws and bolts in furniture assembly – they do not convey content but hold the structure together and give grammatical meaning to the sentence.
• Examples of function words: and, or, but; determiners (the, a, this, that); auxiliaries (have, have been, will be); complementizers (that, whether).
• Examples of content words: dog (noun), jump (verb), quick (adjective), happily (adverb).
• Some borderline/quirk cases: words like of can be function words with little standalone meaning but essential syntactic roles; gimbal is a content word even if its precise meaning is not transparent.
• Role of function words in sentence structure: they contribute grammatical sense and connect content words, without typically adding substantial new semantic content themselves.

Notation and Representation: Brackets vs Onion Diagrams

• Bracket notation: a linear bracketed representation of a word’s morpheme structure, used to show the order of attachment but not always the hierarchical embedding clearly.
• Onion diagram (bracketing with nested layers): a more intuitive, hierarchical visualization that shows how morphemes stack inside one another, akin to peeling layers of an onion.
• Both representations are equivalent ways to capture the same structure; onions are often easier for beginners to read, but brackets provide a formal, precise representation.
• Practical takeaway: when you see a complex multi-morpheme word, you can parse it with either method, ensuring the hierarchical order of morphemes is preserved.

A Concrete Example: The Blue Sentence and Morpheme Roles

• Example sentence: The bunnies hopped because when bunnies are hopping happily, unhappiness hops away.
• Analysis highlights:
  • Verbs with multiple inflectional/derivational forms: hopped (past tense), hopping (present participle), hops (third person singular present).
  • Derivational vs inflectional: hopped shows inflectional past tense; hopping is present participle inflection; unhappiness is a derived noun via the -ness suffix from unhappy (an adjective) to form a noun meaning the state of being unhappy.
  • The presence of adjacent words with related base forms (bunny, bunny, hopping, happiness, unhappy) illustrates how derivational morphemes create related words while inflectional morphemes mark grammatical information.
  • The sentence shows that inflectional endings often do not add new lexical meaning but provide grammar (tense, number, agreement), while derivational endings create new meanings and can alter syntactic category.
• Important observations:
  • The e d ending here indicates past tense (inflectional morpheme).
  • The -ing ending marks progressive aspect or gerund formation (inflectional).
  • The s on hops signals third person singular present tense (inflectional).
  • The -ness suffix in unhappiness is derivational, turning an adjective into a noun (a new word with a new semantic category).
  • The presence of both inflectional and derivational morphemes in close proximity demonstrates how a single word can carry layered grammatical information and meaning.
• Key takeaway: even a seemingly silly sentence provides rich data about how inflectional and derivational morphemes interact, and why hierarchical structure matters for deriving correct forms and meanings.

Productivity and the Mental Representation of Morphology

• Productivity is treated as evidence for rule-governed knowledge of language in the brain: if a morpheme is productive, speakers can apply it broadly to new roots with predictable outcomes.
• English presents a mix: some derivational morphemes are extremely productive (e.g., -able, -ize, -er) while others are more fixed or limited (e.g., certain diminutive suffixes like -let, -ling may be less productive across the lexicon).
• Examples of varying productivity:
  • Highly productive: -able (readable, fixable), -ize (modernize, nationalize).
  • Less productive or irregular: -let (piglet is driven by semantic constraints rather than wide productivity), -ling in some cases (darling, duckling) but not freely applied to all bases.
• Some morphemes may appear in familiar words but are not productive for general word formation (e.g., -le in sparkle, sprinkle, freckle may not function as a productive, independent morpheme across the lexicon).
• A word’s ability to be decomposed into morphemes can vary: certain high-frequency words resist easy decomposition, while others reveal multiple layers of derivation (e.g., hospitalized, vaporized).
• Productivity is a central diagnostic for teachers and researchers: it provides a basis for predicting which new words are likely to be coined by speakers and which are likely to stay lexicalized as fixed items.
• Pedagogical implication: teaching morphology with a focus on productive patterns helps learners acquire vocabulary faster and understand new coinages more readily.

Prefixes and Suffixes: Common Derivational and Prefix Patterns

• Derivational suffixes that convert verbs to adjectives:
  • -able: fix → fixable (adjective)
  • -ible: possible → impossible (note: derivational with negation via prefix)
  • -ive: create adjectives from verbs (e.g., active → active?; more typical is to form adjectives that modify nouns)
• Derivational suffixes that change noun/adjective forms:
  • -ment: develop → development (noun from verb)
  • -hood: child → childhood (state/condition)
  • -ness: kind → kindness (state/quality)
  • -er / -or: noun/agentive (painter, driver)
  • -ish: green → greenish (approximate quality)
  • -y: cloud → cloudy (adjective from noun)
  • -al / -ic / -ous: form adjectives from nouns (national, poetic; classic examples discussed: national, poisonous)
• Derivational prefixes that shift meaning or category:
  • anti-: antihero (prefix to noun to form another noun/adjective)
  • de-: deactivate (to remove a property or state), demystify, discontinue, disobey (shift meaning and sometimes part of the speech category)
  • re-: rewrite, redo (again-ness; preserve or modify action)
• Prefixes often do not change the syntactic category as frequently as suffixes do; English prefixes tend to alter meaning or direction rather than category in many cases, though there are exceptions.
• Compounding and recycling morphemes: words like nationalize or denationalize illustrate how existing units are reused and recombined with additional morphemes to create new words with new meanings.

The Brackets vs Onion Diagram: Reading and Building Morphology

• Onion diagram approach: nested, layered representation that explicitly shows which morphemes attach to others, building up the word step by step.
• Bracket notation: square-bracket representations that indicate the same hierarchical structure, with matching left and right brackets signifying the boundaries of morpheme groups.
• Practical takeaway: both representations encode the same information; start with a root and add morphemes from inner to outer layers, ensuring proper ordering (derivational components before inflectional ones when appropriate).
• Example parse exercise (as discussed in class): a complex word such as onion (root) + finalizers can be bracketed to reveal the order: for instance, a hypothetical word final + ize + al might be parsed as [root [finalizer [derivational -ize] [derivational -al]]], with inflectional endings added last if applicable.
• Important rule: inflectional morphemes are typically added after derivational morphemes and do not alter the syntactic category (they merely provide grammatical information).
• Final note: understanding these notations helps in reading and producing accurate morphological parses and in recognizing how words carry layered meaning and grammar.

Latin Example: Word Order and Inflectional Relationships

• A Latin example is used to illustrate that grammatical relationships can be expressed by inflectional endings, allowing flexible word order without sacrificing meaning:
  • In English, word order often constrains meaning; inflectional morphology provides some of that information, enabling variations in word order while preserving meaning.
  • The comparison shows that English relies on inflectional endings to indicate tense, number, and other grammatical relations, while Latin uses case endings to signal grammatical roles, enabling different sequences of subjects and objects without ambiguity.
• Practical implication: inflectional systems can reduce dependency on fixed word order and provide robust cues for parsing sentences in real-time processing and language acquisition.

Practical Implications and Pedagogy

• Morphology is increasingly part of K-12 curricula, reflecting the value of morphological awareness for literacy and language learning.
• Teaching recommendations drawn from the lecture:
  • Emphasize the distinction between derivational and inflectional morphemes to help learners understand both word formation and grammatical variation.
  • Use bracket and onion diagram representations to teach hierarchical structure and how morphemes combine to form complex words.
  • Highlight productivity patterns to help students predict likely word formations and understand why some words feel more native or rhythmic than others.
  • Include real-world examples (like national/nationalize/denationalize) to show step-by-step derivation and how new words can be built.
  • Use silly or contrived sentences (like the blue sentence) to isolate specific morphemes and demonstrate how they function in context without extraneous complications.
• Real-world relevance: understanding morphology enhances vocabulary, spelling, reading comprehension, and the ability to learn foreign languages where morphological rules differ.
• Limitations and cautions: English morphology is messy due to its history; not all morphemes fit neatly into rule-based patterns, so memorization is still needed for many irregular forms.

Quick Reference: Summary of Key Morphemes and Rules

• Inflectional morphemes (examples):
  • Third person singular present: $-s$ on verbs when the subject is third person singular in the present; e.g., "he walks".
  • Past tense: $-ed$; e.g., "walked".
  • Present participle / progressive: $-ing$; e.g., "walking".
  • Plural: $-s$ on nouns; e.g., "cats".
  • Possessive: $-'s$; e.g., "dog's".
  • Past participle: $-en$ or irregular forms (e.g., eaten, driven).
  • Comparatives and superlatives: $-er, -est$ (e.g., bigger, biggest).
• Derivational morphemes (examples):
  • Suffixes turning verbs into adjectives: $-able, -ible$ (e.g., fix → fixable).
  • Noun-forming suffixes: $-ment, -hood, -ness$ (e.g., movement, childhood, kindness).
  • Agentive suffixes: $-er, -or$ (e.g., painter, driver).
  • Adjective to noun/verb forms: $-ness, -ment, -ish, -y, -al, -ic, -ous, -ize, -ify$ (various productive and less productive forms).
  • Prefixes changing meaning or direction: $anti-, de-, re-, un-$ (e.g., antidepressant, deactivate, rewrite, undo).
• Word classes and roles:
  • Content words: nouns, verbs, adjectives, adverbs (open class).
  • Function words: conjunctions, determiners, auxiliaries, complementizers (closed class).
• Notation and interpretation:
  • Bracketed trees and onion diagrams are two ways to represent morpheme structure; they are equivalent in meaning but differ in readability.
  • Inflectional morphemes typically do not change syntactic category and are added last; derivational morphemes can shift category and meaning.

Key Takeaways for Exam Preparation

• Know the difference between derivational and inflectional morphemes, with examples of each and how they affect meaning and syntax.
• Understand productivity as a testable concept for whether a morpheme can be used broadly to form new words.
• Be able to parse a word into root, derivational affixes, and inflectional affixes, and explain the hierarchical structure behind it (using bracket or onion notation).
• Recognize content vs function words and how they contribute differently to sentence structure and meaning.
• Apply the ideas to example words (e.g., nation → national → nationalize → denationalize) and explain each step’s effect on meaning and grammar.
• Appreciate how inflectional morphology interacts with word order and how heavy inflection can reduce the need for fixed word order in a sentence.