Modality — residual and formal

By C2 you have controlled the core modals (can/could, may/might, will/would, shall/should, must, ought to) for years. The remaining work is at the residual layer: the semi-modal constructions that surface in formal AmE writing and the modal stacking patterns that allow stacked epistemic and aspectual readings. These are the markers that distinguish a fluent C1 writer from a native-like C2 prose stylist.

The residual modal vocabulary — be liable to, be apt to, be prone to, be inclined to, had better, would sooner, would rather, dare, need (as modal), used to — sits between full modals and lexical verbs. Each carries a distinct nuance that loose synonymy obscures. A C2 reader knows that prone to implies an undesirable disposition (one is prone to error, not prone to virtue) and that apt to is the most neutral of the three.

Modal stacking — must have been being followed — is the syntactic limit of English auxiliary chains, used in formal writing and journalism for layered epistemic-aspectual claims. Russian has no comparable stacking; the construction has to be parsed and produced consciously at C2.

Semi-modal be + ADJ + to expressions

Be liable to — likely to (often unwelcome)

• The hinge is liable to break under sustained pressure.
• Witnesses are liable to misremember details across years.
• In this weather, the roads are liable to ice over.

Liable to carries a risk-or-undesirable-outcome sense. It is the modal of caveat and warning. Common in technical writing, insurance documents, and legal prose.

Be apt to — disposed to, characteristically likely

• He is apt to dismiss any criticism of his methodology.
• Late-career writers are apt to repeat themselves.
• The market is apt to overreact to early-quarter signals.

Apt to is dispositional — it ascribes a habitual or characteristic tendency. More neutral than liable to; works for both positive and negative outcomes, though negative is more common.

Be prone to — disposed to (almost always negative)

• Cabinet ministers are prone to misspeak when fatigued.
• He is prone to sudden enthusiasms.
• The aircraft was prone to stalls at low altitude.

Prone to is the most clearly negative of the three. Prone to error, prone to violence, prone to delay — the canonical collocations are all undesirable. Saying someone is prone to generosity sounds wrong.

Be inclined to — tending toward (often a judgment or attitude)

• I am inclined to agree with the dissent.
• She is inclined to see the worst in any situation.
• The board is inclined to approve the motion.

Inclined to often introduces a judgment, view, or evaluative stance. Common in op-ed writing and academic argument. The most polite of the four for personal stance: I am inclined to think X is softer than I think X.

Be wont to — habituated to (archaic, literary)

• He was wont to rise before dawn.
• The committee is wont to delay decisions of consequence.

Wont to is literary and slightly archaic in AmE. Once a year in an essay; never in business email. Pronunciation note: AmE has two attested pronunciations — /woʊnt/ (rhymes with don’t, the older and more careful form) and /wɔnt/ ~ /wɑnt/ (homophonous with want, common in current AmE). Either is acceptable; the /woʊnt/ form is slightly more careful-literary.

Comparison table

Modal stacking — must have been being followed

English does not normally stack modals (will can is ungrammatical), but a modal followed by perfect + progressive + passive is grammatical and useful:

Examples

• By the time she noticed the second car, she must have been being followed for hours. (modal + perfect + progressive + passive)
• The patient might have been being treated with the wrong dosage for days before the chart was reconciled.
• That portrait could have been being restored when the fire broke out.

The stack is rare in speech but unremarkable in journalism and forensic writing. It conveys layered meaning: epistemic (must) + aspect (have been + V-ing — extended past activity) + passive (the subject is the patient, not the agent).

Reading the stack

To parse, read inside-out:

1. being followed — passive progressive: someone was actively following her.
2. been being followed — perfect aspect on the progressive: this had been happening over a span up to a reference point.
3. have been being followed — perfect-progressive: by the time of reference, the following had been ongoing.
4. must have been being followed — epistemic certainty about the perfect-progressive passive.

This is the densest auxiliary chain English permits. C2 readers should recognize it on first pass; C2 writers should deploy it sparingly when no shorter form works.

Would for past habits — beyond simple repetition

You learned at B2 that would (uncontracted) names a past habit: Every summer, my grandmother would bake bread. At C2 the nuance becomes important.

Would for characteristic behavior, with a narrative or wistful tone

• He would sit at the same table every afternoon, watching the river.
• She would call her sister on the first of every month, without fail.
• In those days, you would see him walking the same route at the same hour.

This would paints a portrait. It evokes memory, repetition, and often nostalgia.

Would vs used to — the deep distinction

Read this passage:

My grandmother used to live in a small town in Vermont. Every summer, my brother and I visited her there. She would bake bread on Sundays. She would read to us before bed. She would tell us, again and again, that we should never quite trust the postmaster.

Used to opens the past period; would fills it in. This is the prototypical AmE narrative rhythm — used to once, then would repeatedly.

Would cannot be used for stative past

• He used to know her well. (correct — state)
• He would know her well. (wrong meaning — sounds like predicted present habit)

State verbs (know, own, believe, love, like, understand) take used to, not would.

Had better — the urgency modal

Had better (and its contracted ‘d better) carries a stronger warning than should:

• You had better finish that report by Friday. (warning: consequence implied)
• We ‘d better leave now or we’ll miss the train. (urgency)
• He ‘d better not speak to her like that again. (threat)

The form looks like a past tense (had) but refers to the present/future. The implied second clause is …or else (negative consequence).

In writing, had better is more common than in BrE; in casual AmE it often reduces to better alone: You better not show up late again.

Dare and need — modal vs lexical use

Both dare and need have two grammatical lives: as modals (no third-person -s, no do-support, bare infinitive) and as lexical verbs (regular conjugation).

Dare as modal

• Dare I suggest he is overreacting?
• I dare not speak her name. (literary)
• How dare you? (exclamation, fixed)
• He dare not show his face there again. (literary)

Dare as lexical verb

• I don’t dare to suggest it. (more common in casual)
• She dared him to jump. (transitive lexical)

The modal dare is largely archaic except in fixed phrases (how dare you, I dare say). In modern AmE, lexical dare dominates.

Need as modal

• You needn’t worry. (literary; modern AmE prefers you don’t need to worry)
• I need not remind you… (formal/rhetorical)
• Need I say more? (rhetorical question)

The modal need survives in formal writing and rhetorical questions; lexical need to is dominant in modern AmE.

Be to — formal future and obligation

• The committee is to meet at noon. (scheduled, formal)
• No one is to leave the room. (instruction, semi-imperative)
• She was to become the first woman to argue before the court. (destined-to-be, narrative)

Be to is a formal modal of arrangement, instruction, or destined-future. Common in journalism and historical writing.

Would have liked to have done — the double-perfect counterfactual

A heavily debated construction in modern English style:

• I would have liked to have seen that.
• I would have liked to see that.

Both occur. Many style guides prefer the second (single perfect) as logically tidier. AmE writers use both freely; the double-perfect (would have liked to have) is slightly more emphatic and slightly less crisp. Both are grammatical; choose by ear.

AmE notes

• Semi-modals be liable/apt/prone/inclined to are heavily used in AmE academic and journalistic writing. They are register-lifting alternatives to plain may/might.
• Should + bare infinitive for hypothetical (Should you change your mind) is AmE formal corporate prose.
• Would for past habit in AmE narrative is unmistakable: Bill Bryson, John McPhee, Joan Didion all use it heavily.
• Better alone (without had) is colloquial AmE: You better call her. In writing, restore had: You’d better call her.
• Modal dare and need in AmE survive in rhetorical questions (How dare you? Need I remind you?) and literary contexts. Otherwise lexical.
• Would have liked to have done is more common in AmE than in BrE; both forms coexist.

Literary and archaic notes

The modal wont (was wont to rise before dawn) is a hallmark of 19th-century AmE prose — Hawthorne, Melville, James — and surfaces in elevated 21st-century essays for affected antiqueness. Need not (I need not remind you) is a courtroom and pulpit form. Be to (She was to become president) is the historian’s modal of destined-future.

Common Russian-speaker mistakes

1. Confusing apt to with able to: He is apt to fix the bug (sounds like prediction of disposition, not capability) → He is able to fix the bug (capability). Apt is dispositional, not capacity-oriented.
2. Positive collocations with prone to: She is prone to generosity → She is inclined to generosity or She has a tendency toward generosity. Prone to almost always marks defect or risk.
3. Stacking modals directly: I will can come tomorrow → I will be able to come tomorrow. English does not stack modals; use lexical substitutes (be able to, have to).
4. Using would for past states: I would know her well when we were students → I used to know her well when we were students. State verbs take used to, not would.
5. Forgetting the auxiliary chain order: must been being followed have → must have been being followed. The order is modal + have + been + being + V3.
6. Calquing Russian habitual past as would without used to setup: jumping into Every Sunday she would bake bread without first establishing the past period reads as abrupt. AmE prefers to anchor: In those days, she used to live alone. She would bake bread on Sundays…
7. Translating должен uniformly as must: Я должен идти = I have to go (obligation, neutral) or I must go (slightly stronger or more formal); Он должно быть устал = He must be tired (epistemic). Russian должен is polysemous; English distinguishes deontic must/have to from epistemic must.

Summary

• Semi-modals be liable/apt/prone/inclined/wont to layer in register-lifting modality with distinct polarities.
• Modal stacking — must have been being followed — is the limit of English auxiliary chains; rare in speech, common in formal writing.
• Would for past habit pairs with used to in AmE narrative: used to opens the period, would fills it.
• Had better is the urgency modal; be to is the formal future/arrangement modal.
• Modal dare and need survive in fixed/rhetorical contexts; lexical use dominates elsewhere.
• AmE prose is fluent in these forms; C2 production requires conscious choice among the available semi-modal partners.

Next lesson: Passive mastery and impersonal — get-passive vs be-passive, passive of phrasal verbs, It is said + S to V, and the impersonal one vs you.