The English subjunctive is a set of verb patterns used mainly in formal statements, fixed expressions, and unreal or wished situations. In modern English, it is limited, and many speakers replace it with modal verbs or ordinary tense forms. Because of this, usage often varies by region, formality, and personal style.

After verbs such as suggest, demand, recommend, insist, or require, English can use a that-clause with the bare verb form. This pattern is often called the mandative subjunctive. It is common in formal English, especially in American English, while other varieties may prefer should or an ordinary form.

Word or Phrase	Definition
suggest	This verb can introduce a that-clause with the bare verb form after it.
demand	This verb can require a that-clause with the bare verb form in formal use.
recommend	This verb often appears with a formal that-clause using the bare verb form.
insist	This verb can take a that-clause with the bare verb form when stating necessity.
require	This verb can be followed by a that-clause with the bare verb form in official style.

In these that-clauses, the verb stays in the base form for all subjects. There is no s in the third person singular, and be remains be rather than is or are. This structure marks necessity, recommendation, or demand rather than a present-time fact.

Subject	Form
I	be
you	be
he she it	be
we	be
they	be

The subjunctive also appears after adjectives and expressions that show importance, necessity, urgency, or advisability. These patterns often use it is or it was followed by an adjective and a that-clause. In less formal English, many speakers use should instead.

Word or Phrase	Definition
important	This adjective can introduce a that-clause with the bare verb form in formal English.
necessary	This adjective marks obligation or need and often leads to a subjunctive clause.
essential	This adjective shows that something is required and can be followed by the bare verb form.
urgent	This adjective presents immediate need and may take a subjunctive clause.
advisable	This adjective expresses recommendation and can be followed by the bare verb form.

A small number of fixed expressions preserve the subjunctive in modern English. These forms are mostly formal, literary, ceremonial, or traditional. Learners should recognize them because they remain common in public language and set phrases.

Word or Phrase	Definition
God save	This fixed expression uses the bare verb form in a traditional wish or blessing.
Heaven forbid	This phrase expresses a strong wish that something should not happen.
Long live	This expression states a formal wish for continued life or success.
Be that as it may	This phrase introduces contrast while keeping a formal subjunctive form.
Suffice it to say	This expression means that a brief statement is enough in the situation.

After wish, English often uses past forms to show that a situation is unreal, unlikely, or different from reality. In careful grammar, were is traditional for all subjects in unreal wishes, especially with be. In everyday speech, many speakers also use was with I, he, she, or it.

Rule
After wish, a past form can refer to a present situation that is unreal or different from fact.
With be, were is the traditional subjunctive form for all subjects in formal style.
In informal speech, many speakers use was instead of were in some wish clauses.

The same past-form pattern appears in clauses about imaginary or contrary-to-fact situations, especially after if and as if. Here, were is again the traditional subjunctive form with all subjects when the meaning is unreal. This use is more stable in formal writing than in casual conversation.

Rule
After if, past forms can mark a present or future situation as unreal rather than past in time.
After as if or as though, past forms can show that the comparison is not presented as real.
In formal English, were often appears with all subjects when the clause is clearly contrary to fact.

English often allows more than one structure for the same meaning. A formal subjunctive clause, a should-clause, or sometimes an ordinary present form may all appear, depending on region and register. The subjunctive is generally more common in formal written American English, while should is often more common in British English.

Region	Word or Phrase	Regional Definition
🇺🇸United States	bare subjunctive	This form is common in formal written English after verbs and adjectives of recommendation or necessity.
🇬🇧United Kingdom	should clause	This form is often preferred in many standard contexts where American English uses the bare subjunctive.
Many varieties	ordinary form	This form may appear in less formal speech, though some speakers consider it less formal or less precise.

You can now recognize the main English subjunctive patterns in formal, fixed, and unreal contexts. You can use the bare verb after verbs, adjectives, and expressions of necessity or recommendation, and you can identify traditional were in wishes and unreal clauses. You can also judge when English may choose the subjunctive, should, or another form depending on style and region.