The subjunctive mood expresses wishes, hypotheticals, demands, and suggestions — situations that are contrary to fact or not yet real. The past subjunctive uses "were" for all subjects in hypothetical conditionals (If I were taller; If she were here), while the present subjunctive uses the bare infinitive after verbs of demand or recommendation (The teacher insisted that he study; I recommend that she be promoted). Though the subjunctive has faded in casual speech, it remains standard in formal writing and in fixed expressions like "if need be" and "come what may."
Identify subjunctive triggers — verbs like insist, recommend, suggest, demand, and the conjunction "if" in hypothetical conditions — and practice writing sentences with each. Compare "If I was rich" (indicative, treating the condition as possibly true) with "If I were rich" (subjunctive, treating it as contrary to fact) to internalize the distinction.
Mood is the grammatical category that encodes a speaker's relationship to the reality of what they're saying. You already know verb tense (past, present, future) and modal auxiliaries (can, could, might, should) — mood sits alongside these as another dimension of verb meaning. The indicative mood is the default: it makes statements about facts or asks questions about what is real. The subjunctive mood signals a departure from the real: a wish, a hypothetical, a demand, a recommendation — anything the speaker marks as not (yet) actual.
English has two distinct subjunctive constructions. The past subjunctive uses "were" for all subjects in hypothetical conditional sentences. "If I were rich, I would donate half." The subject is "I," and the indicative past would normally be "was" — but "were" is the signal that the condition is contrary to fact. The speaker is not rich and knows it. Compare: "If I was rude, I apologize" — here "was" is the indicative, treating the condition as a real possibility the speaker is uncertain about. The choice of "were" versus "was" after "if" is not arbitrary elegance; it carries real semantic content about how likely or real the speaker believes the condition to be.
The present subjunctive appears in clauses following verbs of demand, recommendation, and requirement: *insist, demand, require, suggest, recommend, ask, mandate*. The structure uses the bare infinitive — the verb without any inflection — regardless of subject. "The committee demands that he appear before them" (not "appears"). "I recommend that she be promoted" (not "is"). "The rules require that all students submit assignments by Friday" (not "submits"). Modal auxiliaries like "should" can often substitute in informal register ("I recommend that she should be promoted"), which is why the present subjunctive sounds formal. Recognizing the trigger verbs is the key skill — when you see *insist, demand, require, suggest, recommend*, expect a bare infinitive in the clause that follows.
Understanding the subjunctive connects directly to your knowledge of modality. Modal verbs like "might," "could," and "should" also mark degrees of non-actuality — possibility, permission, obligation. The subjunctive is essentially the same semantic territory handled by verb morphology instead of a separate auxiliary word. In many languages, this subjunctive territory is far more extensive and prominent than in modern English, where it has retreated largely to formal registers and fixed expressions. Knowing when English uses the subjunctive — and why — gives you command over a nuanced formal register marker that most speakers use only by feel, if at all.