Formal subjunctive and mandative structures

In The report is complete, the verb describes a fact. In We recommend that the report be completed by Friday, the clause describes an action someone wants or requires. That difference explains the formal mandative subjunctive: after certain recommendations and demands, English uses the plain form of the verb, even with a third-person singular subject.

The committee recommended that each applicant submit a portfolio.
It is essential that the original be kept in a secure place.
The chair requested that the names not be published.

There is no -s in submit, and the negative is not + base verb, without do. The form is the same for all subjects: that I submit, that she submit, that they submit. The passive uses be + past participle.

Which words introduce it?

The pattern commonly follows verbs such as recommend, suggest, propose, insist, demand, request, require and ask, especially when someone wants an action to happen. It also follows adjective phrases such as important, vital, essential, necessary:

The lawyers insisted that the clause be removed.
We suggest that the meeting begin with the safety briefing.
It is vital that every machine be inspected before use.

The verb may be omitted from everyday alternatives: We suggest beginning with the safety briefing. Another common form, particularly in British English, is should + infinitive: We suggest that the meeting should begin... The subjunctive can sound especially formal or institutional; should and the gerund often feel more conversational.

The verb insist can express two different ideas

Compare these:

She insisted that he leave immediately.
She demanded that he go.

She insisted that he had left immediately.
She strongly maintained that he had gone.

The first is a request or requirement, so leave is the base form. The second reports a claim about what happened; the verb has ordinary tense. Meaning, not just the word insist, determines the pattern.

Similarly, I suggest that he speak to the manager proposes an action. Compare I suggest that he is the right candidate, which asserts an opinion about who he is. The first clause calls for the plain form because it recommends an action; the second reports a belief and uses ordinary agreement.

Do not confuse it with were in unreal clauses

The form in If I were you, I would wait is often called the irrealis or past subjunctive. It describes an imagined situation, not a demand:

If the building were safer, it could reopen.
I wish the answer were clearer.

In formal usage, were may appear with all subjects for this unreal meaning. Informal English also uses was with I/he/she in many contexts: If I was too direct, I apologise. The mandative pattern is different: They requested that I be present. Do not extend were to ordinary past facts: She was at the office yesterday.

A traditional expression such as lest anyone forget also preserves the plain verb form, but it is formal and relatively uncommon. In contemporary writing, use the subjunctive because the context calls for a requirement or proposal—not to make every that clause sound elevated. I know that she works here is a factual statement and takes normal agreement.

Regional preference and alternatives

The mandative subjunctive is especially visible in American English and in formal institutional styles. British English also uses it, particularly in written rules and recommendations, but should + infinitive is very common:

The panel recommended that the clause be revised.
The panel recommended that the clause should be revised.
The panel recommended revising the clause.

All three can express a recommendation. The first uses the subjunctive; the second makes the modal should explicit; the third uses a gerund phrase and is often concise. The choice depends on register and sentence structure. If the clause has its own subject, that + subject + base verb makes the relationship clear: We ask that every visitor remain behind the line.

Some verbs take different patterns depending on whether they introduce a request or report a fact. They proposed that the meeting begin at nine proposes a start time. They reported that the meeting begins at nine describes a scheduled fact and uses ordinary agreement. The trigger verb alone cannot tell you which form to choose; decide whether the clause is a desired action or a statement about reality.

The subjunctive is not a shortcut for every formal sentence. After hope, know, think and say, use the form that expresses the intended meaning: I hope she is well; I know he works here. In We demand that he be present, the plain form reflects the demand. This contrast is useful when editing because a missing -s is correct in one clause and an error in another.

Sources

• Cambridge Dictionary: Suggest
• Cambridge Dictionary: Subjunctive