The subjunctive form of a verb is used in noun clauses after verbs or adjectives expressing urgency, obligation, or advisability, such as "demand", "insist", "propose", and "recommend". The subjunctive form is always the same as the base form of the verb regardless of time frame. Noun clauses following verbs and adjectives without urgency, obligation, or advisability do not require the subjunctive form.

1. SUBJUNCTIVE

2.  The subjunctive form of a verb is used in noun
clauses following verbs or adjectives of urgency,
obligation, or advisability. The subjunctive form
is always the same as the base form, no matter
what the time frame is.

3. URGENCY, OBLIGATION, OR
ADVISABILITY.
ADJECTIVES VERBS
 Critical  Demand
 Crucial  Insist
 Desirable  Propose
 Essential  Request
 Important  Recommend
 Necessary  Suggest

7. REMEMBER
 Noun clauses following verbs and adjectives that don’t
express urgency, obligation, or adversity don’t need the
subjunctive.
Psychologists agree that too much conflict is
harmful to relationships.
it’s true that he finds his current position very
demanding.
 Infinitive and gerund phrases in place of the
subjunctive.