7.2 Verb Tenses, Subject-Verb Concord & Modals

7.2 Verb Tenses, Subject-Verb Concord & Modals

Verb Typology: Dynamic Action vs Linking & Stative Verbs

Verbs form the operational core of every sentence, asserting what the subject does, feels, experiences, or is. In standard English, verbs are categorized into two fundamental operational classes based on their functional nature: action verbs and linking (stative) verbs.

Action Verbs: Transitive vs Intransitive

Action verbs convey physical movement, observable activity, or mental processes:

• Transitive Verbs: Transfer their action to a receiver—a direct object. Without a direct object, the meaning of a transitive verb remains incomplete. For example, in "The carpenter planed the cedar timber," the verb planed directly impacts the object timber.
• Intransitive Verbs: Express an action or state that does not pass over to a receiver. They do not take a direct object. In "The migratory warblers nested peacefully in the high branches," the verb nested is complete in itself, followed only by adverbial modifiers describing how and where.

Linking & Stative Verbs

Unlike action verbs, linking verbs (also known as copulas) do not express physical or mental effort. Instead, they serve as an equal sign ($=$) connecting the grammatical subject to a subject complement—a predicate adjective that describes the subject, or a predicate noun that renames it.

• The Verb 'To Be': The most common linking verb across its various inflections (am, is, are, was, were, been, being). Exemplar: "Marcus was the captain of the cricket team."
• Sensory Linking Verbs: Verbs relating to the five physical senses, such as look, smell, taste, sound, and feel. Exemplar: "The freshly baked cassava bread smelled delightful."
• Condition and State Verbs: Verbs reflecting stability or transformation, such as seem, appear, become, remain, stay, and grow. Exemplar: "The parched hillside became lush and verdant after the October rains."

Verb Tenses & Aspect Framework

Tense indicates the time of an action (past, present, or future), while aspect indicates the nature of that action—whether it is habitual, continuously ongoing, or completed prior to another reference point. Combining the three temporal frames with the primary aspects produces the comprehensive English tense framework.

Verb Tense & Aspect Grid Table

Irregular Verbs: Past Tense & Past Participles

While regular verbs form their past tense and past participle uniformly by appending the inflectional suffix -ed (climb -> climbed -> climbed), irregular verbs alter internal root vowels, change consonant endings, or preserve their base form across all forms.

Irregular Verb Reference Chart

Subject-Verb Concord: Foundational Principles & Advanced Rules

Concord (agreement) requires that the grammatical subject and its corresponding finite verb match in person and number. Singular subjects demand singular verbs (which typically append an -s or -es in the simple present tense: the boat glides), whereas plural subjects demand plural verbs (which retain the uninflected base form: the boats glide).

Although simple sentences present minimal difficulty, complex sentence structures require systematic analytical rules:

1. The Intervening Phrase Rule

The grammatical subject of a sentence is never contained within a prepositional phrase, participial phrase, or parenthetical modifier. Intervening expressions such as along with, as well as, together with, in addition to, accompanied by, or including do not alter the number of the subject.

• Incorrect: "The basket of ripe yellow mangoes were delivered to the kitchen."
• Correct: "The basket [of ripe yellow mangoes] was delivered to the kitchen." (The subject is the singular noun basket, not the plural object of the preposition mangoes).
• Correct: "The school principal, together with five senior science teachers, is attending the national symposium." (The singular subject principal governs the singular verb is).

2. Compound Subjects: 'And' vs 'Or / Nor'

• Joined by 'And': Two or more distinct subjects connected by and generally form a compound plural subject requiring a plural verb. Example: "Devon and Shanice conduct the laboratory test."
  • Special Exception (Unitary Concepts): When two words joined by and represent a single integrated dish, recognized entity, or compound concept, the subject is treated as singular. Example: "Rice and peas [single culinary dish] is the traditional Sunday side dish."; "Bread and butter is served at breakfast."
• Joined by 'Or' or 'Nor' (The Proximity Rule): When two or more subjects are connected by or, nor, either...or, or neither...nor, the verb agrees in person and number with the subject placed closest to it.
  • Exemplar A: "Neither the head coach nor the players were satisfied with the second-half performance."
  • Exemplar B: "Neither the players nor the coach was satisfied with the second-half performance."

3. Collective Nouns as Subjects

Collective nouns (family, team, jury, class, committee, flock, government) describe an organized aggregate of individual members:

• Singular Treatment: When the group operates as a single, undivided unit performing an identical collective action, use a singular verb. Example: "The judging panel has awarded first place to the St. Ann youth orchestra."
• Plural Treatment: When the individual members of the group act separately, discordantly, or in mutual conflict, use a plural verb. Example: "The judging panel have divided their votes among three different candidates."

4. Indefinite Pronouns Concord

• Invariably Singular Indefinite Pronouns: Words ending in -one, -body, -thing, along with each, either, and neither, are strictly singular and demand singular verbs:
  • Everyone, everybody, someone, somebody, anyone, anybody, no one, nobody, each, either, neither.
  • Exemplar: "Each of the newly constructed medical clinics features solar energy panels."
  • Exemplar: "Neither of the two alternative coastal routes leads to the harbor."
• Invariably Plural Indefinite Pronouns: Words designating plural quantities require plural verbs:
  • Both, few, many, several.
  • Exemplar: "Several of the botanical specimens require continuous greenhouse irrigation."
• Variable Indefinite Pronouns (The SANAM Principle): Five common indefinite pronouns—Some, Any, None, All, Most—vary depending on the nature of the noun found in the subsequent prepositional phrase:
  • If the object of the preposition is an uncountable mass noun, the verb is singular.
  • If the object of the preposition is a plural countable noun, the verb is plural.
  • Exemplar 1: "All of the imported sugar has dissolved in the vat." (Uncountable mass noun sugar -> singular verb has).
  • Exemplar 2: "All of the sweet oranges have fallen from the branches." (Plural countable noun oranges -> plural verb have).
  • Exemplar 3: "None of the fresh river water is contaminated." (Uncountable -> singular).
  • Exemplar 4: "None of the stone carvers are absent today." (Countable plural -> plural).

Subject-Verb Agreement Decision Rules Table

Modal Auxiliaries & Shades of Meaning

Modal auxiliary verbs (can, could, may, might, must, should, will, would, shall) combine with the uninflected base form of a main verb to express grammatical mood—indicating degrees of ability, authorization, obligation, necessity, or conditional probability. Modal verbs do not conjugate or add an -s suffix for third-person singular subjects.

Primary Modal Auxiliaries & Functional Interpretations:

• Can / Could:
  • Can: Signifies present physical or mental ability ("The diver can descend thirty feet without breathing apparatus"), or informal permission.
  • Could: Signifies past ability ("In her youth, she could run ten miles easily"), polite request ("Could you pass the atlas?"), or remote hypothetical capability.
• May / Might:
  • May: Conveys formal or institutional authorization ("Candidates may commence the examination now"), or moderate probability ("The heavy thunderclouds may bring rain by afternoon").
  • Might: Indicates a more tentative, remote, or doubtful possibility ("We might hike the trail if the landslides are cleared, though it remains unlikely").
• Must / Should:
  • Must: Asserts absolute necessity, legal obligation, or compelling logical deduction ("Motorists must halt at the red traffic signal"; "The light is burning, so someone must be inside").
  • Should (and Ought to): Asserts moral advisability, ethical responsibility, or recommended practice ("Citizens should preserve coastal mangrove wetlands"; "You ought to verify the calculations before submitting").
• Will / Would:
  • Will: Expresses resolute future intention or certainty ("The administration will inaugurate the new library on Monday").
  • Would: Expresses past habitual routine ("During summer holidays, Tata Joseph would tell Anansi stories beneath the guinep tree"), or hypothetical willingness in conditional statements.

Conditional Structures: Zero, First & Second Conditionals

Conditional sentences express hypothetical circumstances and their probable or imagined outcomes. A conditional sentence consists of two parts: the conditional clause (the if-clause) stating the condition, and the independent result clause stating the outcome.

1. Zero Conditional: Invariable Truths & Scientific Laws

Used when the condition always results in the same outcome, representing scientific facts, universal physical laws, or consistent natural behaviors.

• Grammatical Formula: If / When + Simple Present, ... Simple Present
• Exemplar: "If water is heated to 100 degrees Celsius at sea level, it boils."

2. First Conditional: Real & Probable Future Conditions

Used to express realistic conditions that are entirely feasible or likely to occur in the future.

• Grammatical Formula: If + Simple Present, ... will + Base Verb
• Exemplar: "If the cooperative secures adequate agricultural grants, the farmers will install modern drip irrigation across the entire valley."

3. Second Conditional: Hypothetical, Unreal, or Imaginary Situations

Used to describe hypothetical conditions in the present or future that are counter-to-fact, highly improbable, or completely imaginary.

• Grammatical Formula: If + Simple Past (Subjunctive 'were'), ... would + Base Verb
• The Formal Subjunctive Rule: In formal written English, the second conditional requires the subjunctive verb form were for all persons (including I, he, she, it), rather than was.
• Exemplar A: "If Maya were the director of environmental planning, she would protect all virgin coastal coral ecosystems."
• Exemplar B: "If that ancient mahogany tree could speak, it would recount two centuries of parish history."