Syntax 7.5: Affix Hopping in TP, ProgP, PerfP & VoiceP

The Tense Phrase (TP) is the functional projection that carries tense information in a sentence. The TP structure consists of: (1) Tense (T) - the tense marker (past, present, future), (2) Subject (DP) - the subject phrase, (3) Verb Phrase (VP) - the predicate. The tense marker is the head of TP and determines the temporal reference of the entire clause. This structure allows for the systematic analysis of tense in English syntax.

To build complete sentences, we introduce a new type of phrase called the tense phrase (TP), which results from merging a tense element (T) with a verb phrase. The T element handles grammatical features like future tense (as in 'will'), modal auxiliaries (like 'can' or 'might'), and other category markers. The complete sentence structure then becomes a TP containing the subject noun phrase and the verb phrase, with the T element serving as the head of the entire clause.

In phrase structure grammar, a sentence is analyzed as a Tense Phrase (TP) consisting of a Noun Phrase (NP) and a Verb Phrase (VP); when modal or auxiliary verbs are present, the TP includes a T category (Tense marker); additionally, Complementizer Phrases (CP) introduced by words like 'that', 'if', or 'whether' consist of a complementizer plus a TP, and can occupy either the VP or NP position in a sentence, with the 'that' complementizer being optionally deletable.

A tense phrase (TP) represents a complete sentence with structure TP → NP T VP, containing an obligatory noun phrase, tense head (T), and verb phrase. The T head is either an auxiliary verb (will, can, could, may, might, must, shall, should) or an abstract +past/-past feature. Phrase chunking involves identifying the VP first (everything except the subject), then the NP (subject), followed by embedded phrases within the VP. For example, in 'Shinji went inside the robot', Shinji is the NP, went inside the robot is the VP, and inside the robot is a PP containing the NP 'the robot'. Every word must be accounted for in this hierarchical decomposition.

A clause or sentence consists of a subject (NP) and a verb phrase (VP), labeled as TP (Tense Phrase). The basic rule is TP → NP VP, where both constituents are obligatory. TP is called a tense phrase because sentences have tense, which is represented in the T node. The T node is optional and can contain modal verbs, auxiliary verbs, or tense markers. For example, 'Cedric might crash the long boat' has T containing 'might,' while 'Cedric crashes the long boat' has no T element.

Lexical categories (lexical categories) have the capacity to make semantic selection - they restrict which types of arguments can fill their positions based on meaning. For example, 'correr' selects for animate subjects. Functional categories make only categorial selection - they select for syntactic categories (SN, SV, SPrep) but do not impose semantic restrictions. This distinction is fundamental to understanding how different types of grammatical elements function in sentence structure.

In syntax, words are categorized into lexical categories (nouns, verbs, adjectives, adverbs) which convey content and meaning, and functional categories (determiners, auxiliaries, conjunctions, complementizers, prepositions, particles) which establish grammatical relationships between sentence constituents; lexical categories are variable and open-class (can undergo affixation and new words can be added), while functional categories are invariable and closed-class (cannot take affixes and have fixed membership).

Parts of speech are classified as open or closed classes. Open classes (nouns, verbs, adjectives, adverbs) allow continuous creation of new words (neologisms)—we constantly invent new nouns, verbs, and adjectives. Closed classes (pronouns, prepositions, determiners, conjunctions, complementizers, auxiliaries, modals, negation) resist new members—no new pronouns or prepositions are created. This distinction parallels lexical vs functional categories: lexical items provide content meaning (open classes), while functional items provide grammatical structure (closed classes). Nouns have multiple subcategories: singular vs plural (marked morphologically with -s, -es, -en), countable vs mass (countable take 'many' and require determiners; mass take 'much'), and proper vs common (proper nouns resist determiners and adjectival modification). Pronouns are marked +pronoun, while other nouns are -pronoun.

English words belong to lexical categories (nouns, verbs, adjectives, prepositions, adverbs) and functional categories. Nouns name people, places, things, or concepts and can take determiners like 'his' or 'the.' Verbs express actions or states. Adjectives describe nouns. Prepositions show location or relationships. Adverbs modify verbs, adjectives, or other adverbs. Functional categories include determiners (pair with nouns), qualifiers (modify adverbs/adjectives), auxiliaries (support main verbs), and conjunctions (join clauses). Understanding these categories helps analyze sentence structure.

Lexical categories (nouns, adjectives, verbs) carry meaning, while functional categories serve grammatical purposes. A single word can belong to multiple categories depending on context—'wrong' functions as noun, verb, adjective, or adverb. Nouns refer to people, places, things, or abstract concepts and can take plural or possessive forms. Adjectives describe noun properties and appear before nouns (attributive) or after linking verbs (predicative). Verbs indicate actions, sensations, or states and have multiple inflected forms (base, past, past participle, present participle, third person singular). These categories form the building blocks of sentence structure.

English verbs can be classified into simple verbs (single words) and compound verbs (multiple words written together), and further categorized by their meaning into action verbs (indicating movement), state verbs (indicating conditions), and position verbs (indicating posture); they can also be classified by transitivity into transitive verbs (requiring an object) and intransitive verbs (not requiring an object), and by duration into momentary verbs (instantaneous actions) and non-momentary verbs (actions with duration); verb forms include base form, past tense, past participle, and present participle, with regular verbs following predictable patterns while irregular verbs have unique forms.

Morphology is the systematic study of morphemes—the smallest units of grammar that cannot be split into smaller parts and carry meaning. English morphology distinguishes between inflectional morphology (which changes grammatical functions like tense, number, and case without changing word class, e.g., 'dogs', 'looked') and derivational morphology (which creates new words with new meanings by adding prefixes or suffixes, e.g., 'unpredictable', 'boyhood'). Morphemes are categorized into free morphemes (standalone words like 'child', 'house') and bound morphemes (prefixes like 'un-', 're-' and suffixes like '-ness', '-ment'). English has extensive derivational morphology for forming adjectives from verbs (e.g., 'agreeable', 'adaptable'), adjectives from adjectives (e.g., 'yellowish'), and adverbs from adjectives (e.g., 'calmly'). Common word-building processes include compounding (e.g., 'bookshop'), conversion (shifting between word classes without affixes, e.g., 'elbow' as verb), back-formation (deleting perceived suffixes, e.g., 'afflict' from 'affliction'), clipping (shortening words, e.g., 'memo'), blending (combining parts of words, e.g., 'smog'), and acronyms (initial letters becoming words, e.g., 'virus'). Languages are classified morphologically along a spectrum from analytic (isolating) languages using primarily free morphemes (like English) to synthetic languages using bound morphemes, including agglutinating languages (clearly separable affixes, e.g., Turkish), fusional languages (fused affixes with multiple meanings, e.g., Spanish), and polysynthetic languages (extremely complex verb forms incorporating nouns, e.g., some Native American languages).

Morphology studies how words are formed from smaller units called morphemes. Prefixes attach at the beginning (unhappy), suffixes at the end (happily), and circumfixes at both ends (misunderstanding). The morpheme '-ment' transforms verbs into nouns (arrange → arrangement). Morphemes are categorized as free (standalone words like 'cat') or bound (must attach to other morphemes like affixes). Bound morphemes include inflectional morphemes (indicating grammatical properties like tense or number) and derivational morphemes (changing word meaning or class).

English morphology involves the study of word formation through various processes including compounding (combining words like 'football' or 'bookstore'), backformation (creating verbs from nouns like 'televise' from 'television'), clipping (shortening words like 'doc' from 'doctor'), and the formation of acronyms and initialisms (like 'NASA' or 'LOL'). These processes demonstrate how English vocabulary evolves and expands through systematic word creation, with compounds often having a 'head word' that determines the meaning, and many words changing their part of speech over time (like 'Google' becoming a verb).

Morphemes are the smallest units of language that carry meaning or grammatical function. English morphemes are classified into free morphemes (which can stand alone as complete words, including lexical morphemes like nouns, verbs, adjectives, and adverbs, and functional morphemes like determiners, conjunctions, prepositions, and pronouns) and bound morphemes (which cannot stand alone and must attach to other morphemes). Bound morphemes are further divided into derivational morphemes (which create new words or change word classes, including nominalizers like -ion, verbalizers like -ize, adjectivizers like -ful, and adverbalizers like -ly) and inflectional morphemes (which add grammatical information without changing word class, including plural -s, 3rd person singular -s, past participle -en, present participle -ing, comparative -er, and superlative -est).